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| DOI：10.13522/j.cnki.ggps.2019248 |
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| Pre-sowing Soil Moisture and Phosphorous Fertilization Affect Yield and Quality of Winter Wheat in Dryland |
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YUAN Yaqi, SUN Min, LIN Wen, XUE Jianfu, YANG Zhenping, HAO Xingyu, GAO Zhiqiang
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College of Agriculture, Shanxi Agricultural University, Taigu 030801, China
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| Abstract: |
| 【Background】The yield of wheat in drylands varies erratically due to the uncertain change in soil moisture and rainfall. Improving soil moisture management is hence critical to safeguard wheat production in these regions. While adding phosphorus is known to increase wheat yield, its impact on quality of wheat under different soil moistures remains elusive.【Objective】The purpose of this paper is to experimentally investigate the change in winter wheat yield and quality in response to pre-sowing soil moisture and phosphorus fertilization in the Loess Plateau of China. 【Method】The field experiment was conducted in the southern Shanxi Province. We compared three levels of pre-sowing soil moisture in 0-100cm soil layer: 248 mm (W1), 233 mm (W2) and 205 mm (W3), and two levels of phosphorus fertilization: 75 kg/hm2 (P1) and 180 kg/hm2 (P2). 【Result】When phosphorus fertilization was the same, the overall grain filling period in W1 and W2 was longer than that in W3. Under the same pre-sowing soil moisture, the period of quick and moderate increase in wheat grain was better in P2 than in P1. It was also found that the coefficients of variation of the period in which the wheat grain increased moderately and the increased grain was 25% and 31%, respectively. Therefore, increasing pre-sowing soil moisture and phosphorus application prolonged the period of quick increase in wheat grain; the duration of grain filling increased with the soil moisture. The duration of slow increase in wheat grain increased inversely with phosphorus fertilization. The equation for dependence of yield on water and phosphorus revealed that the protein yield was the highest when the soil moisture was 250 mm, and under the same soil moisture, the protein yield increased with phosphorus. The results also showed that phosphorus impacted on grain yield more than on protein content. 【Conclusion】The duration for wheat grain to increase changed with both pre-sowing soil moisture phosphorus fertilizer, and the highest yield was when the soil moisture was 250 mm. Phosphorus impacted on grain yield more than on protein content. |
| Key words: dryland winter wheat; pre-sowing soil moisture; phosphorus fertilization; grain filling; protein content |
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