Abstract
Soil water and nutrients are major factors limiting crop productivity. In the present study, soil water use efficiency (WUE) and crop yield of millet and soybean were investigated under nine fertilization regimes (no nitrogen (N) and no phosphorus (P) (CK), 120 kg ha−1 N and no P (N1P0), 240 kg ha−1 N and no P (N2P0), 45 kg ha−1 P and no N (N0P1), 90 kg ha−1 P and no N (N0P2), 120 kg ha−1 N and 45 kg ha−1 P (N1P1), 240 kg ha−1 N and 45 kg ha−1 P (N2P1), 120 kg ha−1 N and 90 kg ha−1 P (N1P2), 240 kg ha−1 N and 90 kg ha−1 P (N2P2)) in the Loess Plateau, China. We conducted fertilization experiments in two cultivation seasons and collected soil nutrient, water use, and crop yield data. Combined N and P fertilization resulted in the greatest increase in crop yield and WUE, followed by the single P fertilizer application, and single N fertilizer application. The control treatment, which consisted of neither P nor N fertilizer application, had the least effect on crop yield. The combined N and P fertilization increased soil organic matter (SOM) and soil total N, while soil water consumption increased in all treatments. SOM and total N content increased significantly when compared to the control conditions, by 27.1–81.3%, and 301.3–669.2%, respectively, only under combined N and P application. The combined N and P application promoted the formation of a favorable soil aggregate structure and improved soil microbial activity, which accelerated fertilizer use, and enhanced the capacity of soil to maintain fertilizer supply. Crop yield increased significantly in all treatments when compared to the control conditions, with soybean and millet yields increasing by 82.5–560.1% and 55–490.8%, respectively. The combined application of N and P fertilizers increased soil water consumption, improved soil WUE, and satisfied crop growth and development requirements. In addition, soil WUE was significantly positively correlated with crop yield. Our results provide a scientific basis for rational crop fertilization in semi-arid areas on the Loess Plateau.
Highlights
Crop growth and development activities require appropriate light, moisture, air, and temperature conditions and adequate amounts of diverse soil nutrients [1,2]
Rational fertilization practices that take into account soil water availability, improve soil water use efficiency (WUE), and improve crop yield have become key strategies for comprehensive agricultural development on the Loess Plateau [13,14]
In the present study, following nine fertilization experiments, we observed that soil organic matter (SOM) and total N content increased significantly when compared to the control conditions, by 27.1–81.3%, and 301.3–669.2%, respectively, only under combined N and P application, over a two-year period
Summary
Crop growth and development activities require appropriate light, moisture, air, and temperature conditions and adequate amounts of diverse soil nutrients [1,2]. Inadequate soil water and soil nutrient levels are the major factors limiting agricultural production in the Loess Plateau [6,7,8]. Agricultural production in such environments should aim at achieving efficient water use [9]. The considerable fertilizer inputs in the region have promoted crop yield greatly, in addition to the associated economic benefits, and the improvement of soil water use efficiency (WUE) of the cropping systems. Rational fertilization practices that take into account soil water availability, improve soil WUE, and improve crop yield have become key strategies for comprehensive agricultural development on the Loess Plateau [13,14]
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