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| Agronomic effects and threshold of phosphorus fertilizer in low phosphorus red soil maize |
| Received:January 18, 2022 |
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| KeyWord:low-phosphorus red soil;response of maize to phosphorus application;utilization efficiency of phosphate fertilizer;agronomy threshold of phosphate fertilizer |
| Author Name | Affiliation | E-mail | | SU Lizhen | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | ZHANG Lianya | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | WANG Sirui | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | CAO Huimin | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | XIAO Jingxiu | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | ZHENG Yi | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China
Yunnan Open University, Kunming 650599, China | | | TANG Li | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | ltang@ynau.edu.cn |
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| Abstract: |
| To promote the efficient use of phosphorus fertilizer in red soil, the application of phosphorus fertilizer must be reduced and efficiency increased, along with providing the theoretical basis for scientific application of phosphorus fertilizer in red soil. A 3-year field experiment was carried out under low phosphorus red soil and four phosphorus application(calculated by P2O5)levels(0, 60, 90 kg·hm-2 and 120 kg·hm-2, marked as P0, P60, P90, and P120, respectively). The effects of phosphorous(P)application rate on maize yield, its utilization efficiency and the response of agricultural threshold of P fertilizer to different application levels was studied. The results showed that application of P fertilizer significantly increased maize yield and sustainable index of maize yield in low P red soil. The maize yield increased with the increase of P application. The maize yield in P120 treatment was the highest, which was significantly increased by 210.48% compared with that in P0 treatment. However, there was no significant difference compared with that in P90 treatment. The partial productivity of P fertilizer and its apparent utilization decreased with the increase of P fertilizer application amount, where P60 was the best treatment. P application significantly increased soil available P content, and P120 treatment had the highest available P content, which was significantly increased by 313.44% compared with P0 treatment on average. The application amount of phosphorus fertilizer in soil phosphorus balance was 19.89~23.00 kg · hm-2. The agronomic threshold of P fertilizer was 97.04 kg · hm-2. In conclusion, rational application of phosphorus fertilizer in low phosphate red soil in southwest China can improve maize yield and agricultural utilization rate of phosphorus fertilizers in season. Under the condition of basic nutrient of phosphorus in this experiment, applying phosphorus according to P90 treatment can achieve the goal of reducing phosphorus and increasing efficiency of maize, while promoting the green development of agriculture. |
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