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Effects of subsoiling on maize yield and water-use efficiency in a semiarid area

  • Yinzhu Jiao , Yanli Yi , Liangshan Feng EMAIL logo , Zhanxiang Sun , Ning Yang , Jialin Yu , Muzi Zheng , Lizhen Zhang and Jiaming Zheng
Published/Copyright: November 30, 2017

Abstract

A 3-year field research was conducted to investigate the effect of four subsoiling methods on maize yield and water use efficiency. These four subsoiling methods included bulk subsoiling in autumn (BS), annual ridge subsoiling in autumn, annual furrow subsoiling in early summer, and interannual alternate zone subsoiling (AS), which were compared with rotary tillage in spring. The results suggested that the bulk density of the soil was alternately changed by AS, but AS had limited effect on the average water storage in the soil. Overall, soil tilled by BS and AS maintained a high water-holding capacity, which could stabilize the yield of maize under varying rainfall across different years. Maize under the AS subsoiling method maintained a relatively higher production capacity and water-use efficiency compared with those under the other three types of subsoiling methods.

1 Introduction

Water resources are often a limiting factor for the sustainable development of agricultural systems, especially in semiarid areas [1]. The ability of the soil layer to hold water in the root zone is important to increase crop yield and water-use efficiency (WUE) as it reduces drought risk during the crop-growing season. Moreover, subsoiling has a direct influence on soil moisture [2,3]. Rain-fed agriculture often faced problems of poor land management due to decentralized farm land, sandy soil, or low economic profit. For example, in the north region of Liaoning in northeast China, where the physical and chemical properties of the topsoil for growing crops are poor and the plow pan is thick and uplifted, the root penetration is limited, reducing the capacity of holding rainfall [4].

Subsoiling, as a commonly used agricultural practice, can effectively loosen soil for receiving and holding more rainfall in the soil and breaking the plow pan for the improvement in water percolation and root penetration [3,4]. The loose soil in the upper layer and compact soil in the lower layer of the root zone are favorable for maize growth and effectively prevent maize stalk lodging in the late season [5]. Subsoiling reduces surface runoff and increases the water availability of the soil, thus improving the potential of boosting crop growth, yield, WUE, and sustainability [6, 7, 8]. Partial subsoiling of alternate strips of tilled and untilled ground in a field was found to increase the water- and nutrient-holding capacity of the soil and reduce soil evaporation [9, 10, 11].

Interannual alternate zone subsoiling (AS) mainly involves the alternate application of ridge subsoiling after the autumn harvest and furrow subsoiling before the elongation of the maize stalk in early summer of the second year. Information regarding the effect of subsoiling methods on the water-holding capacity of the soil is limited in published scientific studies.

Therefore, the objective of this study was to (a) quantify the effects of the intensity and proportion of subsoiling on crop yield, soil physical properties, water uptake, and WUE in rain-fed agriculture; and (b) explore the mechanism of soil improvement and water availability by full and partial subsoiling. The results were used to discuss the application of optimal subsoiling practice in the semiarid region for the sustainable development of rain-fed agriculture in relation to soil erosion and climate change.

2 Materials and Methods

2.1 Experiment Description

This study was conducted at the Experiment Station of Agricultural Environment and Arable Land Conservation in Fuxin, Liaoning, China, located at longitude 121.46, latitude 42.09, and an elevation of 213 m. Zhengdan 958 maize seeds were sown in brown earth on the experimental fields after cleaning the stubble through shallow rotary tillage (to a depth of about 8 cm). The field was free of deep tillage for more than 10 years before the initiation of the experiment. In 2012, 2013, and 2014, the total precipitation in this region was 483.7, 462.3, and 216.3 mm, respectively. Irrigation was not conducted during the experimentation.

2.2 Experimental Design

Five treatments, including bulk subsoiling in autumn (BS; work date was around October 25 every year, and the depth was 28 cm), annual ridge subsoiling in autumn (RS; work date was the same as BS, and the depth was 28 cm), annual furrow subsoiling in early June before maize elongation (FS; the depth was 28 cm), and interannual AS (1 year RS and next year FS; the depth was 28 cm), were implemented and compared with rotary tillage in spring (CK; the depth was 15 cm). Figure 1a shows the subsoiler used for ridge subsoiling, furrow subsoiling, and interannual AS, and Figure 1b shows the subsoiler used for bulk subsoiling. The experimental design was a randomized design with three replicates. The plot size was 30 m in length and 10 m in width.

Figure 1 Two kinds of subsoilers.
Figure 1

Two kinds of subsoilers.

The maize was planted on the ridge and rowed one line on each ridge; the ridge spacing was 50 cm. The plant density of maize was 60,000 plants/ha (with row distance of 50 cm and planting distance of 33 cm), and NPK compound fertilizer (the contents of N, P2O5, and K2O were 15%) was used at a rate of 375 kg/ha. A topdressing of urea with N content of 46% was applied before the maize elongation stage at a rate of 375 kg/ha. Maize was sowed on April 29 and 30, and May 6, and harvested on September 25 and 27, and October 21, in 2012, 2013, and 2014, respectively.

Ethical approval

The conducted research is not related to either human or animals use.

2.3 Measurements

2.3.1 Bulk density of the soil

The bulk densities of the soils were measured using a foil sampler immediately after the maize was harvested. Soils were sampled under the ridge and furrow in each plot; 5 cm was measured for each layer, averaging three iterations. The bulk densities of the soils at depths of 0–15 cm and 15–30 cm were calculated according to Equation 1 using the average of corresponding levels.

ρ=m/ν(1)

where ρ is the bulk density of the soil of one sample, g/cm3; m is the dry weight of the soil in the foil sampler, g; and ν is the sample volume of the foil sampler, cm3.

2.3.2 Moisture content of the soil

The water content in the soil was determined from the date of planting to harvesting and determined once a month. It was measured using an earth boring auger and then oven dried at 150°C. The sampling point in each sampling layer and at the junction of ridge and furrow was 10 cm, and the measuring depth was 100 cm. The water storage in the soil was calculated using Equation 2. The bulk density of the soil at a depth of 0–30 cm was calculated according to the measurements obtained that correlated to each year, and the water content in the soil at a depth of 30–100 cm was calculated according to the average bulk density of 1.46 g/cm3 of the soil. The bulk density of the soil at a depth of 30–100 cm changed a little as the depth of tillage was less than 30 cm.

W=ϕiρihi(2)

where W is the water storage in the soil, mm; φi is the water content in the soil for each soil layer; ρi is the bulk density of the soil for each soil layer, g/cm3; hi is the sampling depth (one soil layer), mm.

2.3.3 Yield

Maize yield for each sample plot (50 m2) was measured once maize ripened.

2.4 Data Analysis

2.4.1 Water uptake

The soil water balance method was used to calculate the water uptake in this study, according to Equation 3.

ET=I+PRODP+CR±ΔSF±ΔSW(3)

where ET is the water consumption of the soil, mm; I and P represent irrigation and rainfall, respectively, of that period, mm; RO is the soil surface runoff for rainfall or irrigation, mm; DP is the deep soil percolation, mm; CR is the groundwater rising from the capillary to the root zone (due to lower groundwater levels, generally ignored), mm; ΔSF is the lateral leakage of the soil, including the lateral inflow SFin and lateral outflow SFout (ignored in this test), mm; and ΔSW is the soil moisture variation, mm.

2.4.2 Water-use efficiency

The WUE of the crops was calculated using Equation 4 [12].

WUE=0.1Y/ET(4)

where WUE is the water-use efficiency, kg/m3; Y is the yield of maize, kg/ha; and ET is the soil water evapotranspiration, mm.

3 Results

3.1 Effects of Different Tillage Methods on the Bulk Density of the Soil

After harvesting, vertical changes occurred in the bulk density of the soil, as shown in Table 1. The results showed that the fields tilled with subsoiling methods significantly reduced the bulk density of the soil compared with CK. The most significant reduction in bulk density was observed using BS and AS tillage methods in 2012 and 2014. In 2013, the most effective reduction in the bulk densities of the soils was noted using the BS method. In different tillage methods, the average bulk densities of 0–15 cm of the soil layer of CK were at the lowest level in the 3 years; the hierarchical orders were as follows: RS > FS > BS ≈ AS > CK in 2012; AS > FS ≈ RS > BS > CK in 2013; and FS ≈ RS > AS ≈ BS ≈ CK in 2014. Although the average bulk densities of 15–30 cm of the soil layer of CK were at the highest level, the order was as follows: CK > RS > FS > AS ≈ BS in 2012; CK > RS ≈ AS ≈ FS > BS in 2013; and CK > RS ≈ FS > AS ≈ BS in 2014.

Table 1

Soil bulk density under different subsoiling treatments in 2011–2014 (unit: g/cm3)

2011201220132014
0–15 cm15–30 cm0–15 cm15–30 cm0–15 cm15–30 cm0–15 cm15–30 cm
CK1.299 aA1.459 aA1.272 dD1.465 aA1.261 dC1.464 aA1.280 bB1.459 aA
BS1.300 aA1.457 aA1.281 cC1.369 dD1.277 cB1.359 dD1.278 bB1.364 cB
RS1.301 aA1.451 aA1.304 aA1.403 bB1.292 bA1.392 bB1.290 aA1.379 bB
FS1.313 aA1.442 aA1.295 bB1.382 cC1.292 bA1.377 cC1.293 aA1.372 bB
AS1.292 aA1.451 aA1.281 cC1.370 dD1.304 aA1.388 bBC1.279 bB1.365 cB
P0.3710.2180.0000.0000.0130.0000.0020.000
  1. BS, bulk subsoiling in autumn; RS, annual ridge subsoiling in autumn; FS, annual furrow subsoiling in early summer; AS, interannual alternate zone subsoiling; CK, rotary tillage in spring.

    Values followed by the same small letter are not significantly different according to least significant difference (LSD) at 0.05 level in the same year, Values followed by the capital letter are not significantly different according to LSD at 0.01 level in the same year.

The lateral variations in bulk density of the soil caused by different tillage methods were also measured (Table 2). The average bulk densities of 15–30 cm of the soil layer of CK were at the highest level regardless of ridge or furrow. The hierarchical order in the ridge position was CK > FS > RS ≈ AS ≈ BS in 2012; CK > FS ≈ AS > FS ≈ BS in 2013; and CK > FS > AS ≈ RS ≈ BS in 2014. The hierarchical order in the furrow position was CK > RS > BS ≈ FS ≈ AS in 2012; CK ≈ RS > AS > BS ≈ FS in 2013; and CK > RS > BS ≈ AS ≈ FS in 2014.

Table 2

Lateral variations of soil bulk density under different treatments (unit: g/cm3)

In 2011In 2012In 2013In 2014
RidgeFurrowRidgeFurrowRidgeFurrowRidgeFurrow
CK1.358 aA1.400 aA1.349 aA1.387 aA1.344 aA1.381 aA1.352 aA1.387 aA
BS1.353 aA1.404 aA1.307 cC1.342 cC1.299 cC1.337 cC1.300 dC1.343 cC
RS1.361 aA1.391 aA1.311 cC1.397 bB1.304 cC1.380 aA1.303 cdC1.366 bB
FS1.348 aA1.407 aA1.339 bB1.339 cC1.338 bAB1.331 cC1.331 bB1.334 cC
AS1.351 aA1.392 aA1.312 cC1.339 cC1.335 bB1.358 bB1.306 cC1.338 cC
P0.4150.1700.0000.0000.0000.0000.0000.001

The primary characteristics of the bulk densities of the soil as a result of using a variety of tilling methods are summarized as follows. The soil tilled by BS was uniformly loose. The soil cultivated by CK showed vertically uneven bulk densities, with relatively loose upper soil and compact lower soil. The soil tilled by the RS technique was characterized by loose ridge soil and compact furrow soil, while FS yielded the opposite result. The soil tilled by AS exhibited alternate change in bulk density and alternately loosened strips of ridge and furrow.

3.2 Effects of Different Tillage Methods on the Water Storage of the Soil

Figure 2a shows the effects of various tillage techniques on the water storage of the cultivated soil. In 2012, 2013, and the early growth stage of 2014, rainfall was sufficient, and the water-holding capacity of the soil greatly increased after subsoiling. In the late growth stage of 2014, an unusual mid-summer and autumn drought occurred in the region [13]. The drought sharply reduced the amount of water that was held in the soil. Perhaps the soil moisture of the subsoiling treatment was one of the key factors for the stable production of crops. The results showed that the average water storage of BS, AS, FS, and RS was 10.9, 10.9, 9.0, and 8.2 mm, respectively, more than CK in 2012 (Fig. 2b). During the maize growth period of 2013, the hierarchical ranking of the average water storage in the soil was BS > AS > FS > RS. The average water storage in the soil of BS, AS, FS, and RS was 16.3, 14.6, 12.7, and 6.0 mm more than CK, respectively. In 2014, the average water storage in the soil of BS and AS during the maize growth period was 23.2 and 17.2 mm more than CK, while that of FS and RS was 15.7 and 7.1 mm more than CK, respectively.

Figure 2 Change in soil water storage (0–100 cm). (a) Change in soil water storage in the study period; (b) average soil water storage in the maize growth period in different years. BS, bulk subsoiling in autumn; RS, annual ridge subsoiling in autumn; FS, annual furrow subsoiling in early summer; AS, interannual alternate zone subsoiling; CK, rotary tillage in spring.
Figure 2

Change in soil water storage (0–100 cm). (a) Change in soil water storage in the study period; (b) average soil water storage in the maize growth period in different years. BS, bulk subsoiling in autumn; RS, annual ridge subsoiling in autumn; FS, annual furrow subsoiling in early summer; AS, interannual alternate zone subsoiling; CK, rotary tillage in spring.

3.3 Effects of Different Tillage Methods on the Yield and WUE of Crops

The yield and WUE of maize in different years were significantly different (Table 3). In 2012, the AS produced the highest yield followed by BS, RS, and FS, which was 18.93%, 17.22%, 11.01%, and 9.45% higher than CK, respectively (Table 3). Similarly, the result in 2014 showed that the AS produced the highest yield followed by BS, RS, and FS, which was 17.38%, 16.21%, 9.91%, and 5.90% higher than CK, respectively. In 2012 and 2013, rainfall was relatively abundant, and the use of subsoiling increased the water storage capacity of the soil and reduced the water consumption of farmland. During the crop growth period in 2012, the water consumption of the soil of AS was 22.3 mm less than CK. The water consumption of the soil of BS was 14.6 mm less than that of CK. In 2013, BS exhibited the least water consumption in the soil, which was 26.9 mm less than CK.

Table 3

Maize yield and water-use efficiency under different subsoiling treatments in 2012–2014

YearTreatmentYield (kg/ha)Water consumption (mm)WUE (kg/m3)
2012CK9473.6 d459.4 a2.06 d
BS11507.3 b444.8 d2.59 b
RS10738.4 c455.8 b2.36 c
FS10726.5 c451.8 c2.37 c
AS12188.0 a437.1 e2.79 a
2013CK10752.3 c433.2 a2.48 c
BS12788.03 a406.3 c3.15 a
RS11936.2 b421.5 b2.83 b
FS11768.0 b413.1 b2.85 b
AS12603.9 a416.1 b3.03 a
2014CK8172.0 e303.2 b2.70 c
BS9497.0 b326.0 a2.91 b
RS8981.5 c305.8 b2.94 ab
FS8654.0 d312.7 a2.77 b
AS9592.2 a311.7 b2.97 a

A severe drought occurred during the 2014 experimentation period. A large amount of water stored in the soil was consumed during the whole growth period for BS and FS, which was 22.8 and 9.5 mm more than CK, respectively. The water consumption of AS, RS, and CK was not significant. The comparison of WUE of different treatments showed that it was the highest in 2012 by AS, followed by BS, FS, and RS, which was 0.73, 0.53, 0.31, and 0.30 kg/cm3 more than CK, respectively. WUE was the highest in 2013 by BS and AS, followed by FS and RS, which was 0.67, 0.55, 0.37, and 0.35 kg/cm3 more than CK, respectively. Moreover, the results in 2014 showed that WUE was 0.27, 0.24, 0.21, and 0.07 kg/cm3 more by AS, RS, BS, and FS, respectively, compared with CK.

4 Discussion and Conclusion

Cultivation is an important agricultural practice in China, as farmland is seldom left fallow. Intense tillage and land cultivation have been a part of Chinese agriculture for thousands of years [14]. Subsoiling can reach profound soil layers and break up the plow pan. Therefore, soil conditions are usually improved by reducing the bulk density of soil and increasing soil permeability. This practice can facilitate the filtration of rainwater and increase the water content on the topsoil, thus promoting crop production [15,16].

The results of this 3-year field research revealed the effect of different tillage methods on the bulk density of the soil. The soil tilled by the BS technique was uniformly loose, and the soil tilled by the CK technique showed vertically uneven bulk densities, with relatively loose upper soil and compact lower soil. The soil tilled by the RS technique was characterized by loose ridge soil and compact furrow soil, while the FS-tilled soil yielded the opposite result. The soil tilled by the AS technique showed alternating changes in bulk density and alternately loosened strips of ridge and furrow. Previous studies demonstrated that the bulk density of the soil was closely related to the water storage capacity of the soil [17,18]. Subsoiling operations were carried out in the farmland ridge and furrow in the autumn of 2011 and early summer of 2012, respectively. The soil was not tilled deeply during the period from the 2012 crop harvest to the 2013 crop harvest. Then, subsoiling operations were carried out in the autumn of 2013 and early summer of 2014, respectively. Consequently, the bulk densities of the soil varied across the different years. However, the findings of the present research indicated that the variations in bulk densities might not affect the water storage capacity of the soil. AS and BS maintained a high water storage in the soil, which could stabilize the maize yield across years with varied rainfalls. This could be attributed to the subsoiling with aftereffect [19,20], and soil moisture retention effect across years [2]. The increased range of the average water storage in the soil during the crop growth period by BS, AS, FS, and RS was 10.9–23.2, 10.9–17.2, 9.0–15.7, and 6.0–8.2 mm, respectively, compared with CK in 3 years.

The findings of this 3-year field research suggested that subsoiling has the potential to create favorable growth conditions for maize by increasing the water content and permeability of the soil. Subsoiling methods were highly effective in increasing maize yield and WUE. Compared with the other three subsoiling methods, the AS method continued to maintain higher production capacity and WUE. Moreover, AS and BS were associated with similar soil water storage capacity. Previous studies suggested that the composite topsoil structure composed of both loose and compact soil layers in interval subsoiling could facilitate the upward movement of water to topsoil in the dry season and help crops resist lodging [4,5]. AS had the advantages of interval subsoiling and provided greater water storage capacity than BS. Consequently, AS produced higher WUE and yield compared with BS in 2012 and 2014. Compared with RS and FS, the alternate subsoiling method was superior for reducing the bulk density of the soil, improving the structure of the soil, increasing water storage capacity of the soil, and maintaining higher crop productivity. Bulk tillage usually consumed more energy than zone subsoiling [21], and thus AS was a cost-effective method of subsoiling. Overall, the results of this study suggest that the AS method is a more beneficial subsoiling method compared with the BS, RS, FS, and CK methods.

Acknowledgments

The study was conducted with the support of the National High-Level Talent Special Support Program of China (outstanding young scholars), the Special Fund for Agro-scientific Research in the Public Interest of China (201503105, 201303125), the China Postdoctoral Science Foundation (178093), and the Cultivation Plan for Youth Agricultural Science and Technology Innovative Talents of Liaoning Province (2014017).

  1. Conflict of interest: Authors state no conflict of interest

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Received: 2017-7-17
Accepted: 2017-9-8
Published Online: 2017-11-30

© 2017 Yinzhu Jiao et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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