Optimized NPK fertilizer recommendations based on topsoil available nutrient criteria for wheat in drylands of China

作者：Wenjie Yang, Jie Yu, Yanhang Li, Bingli Jia, Longgang Jiang, Aijing Yuan, Yue Ma, Ming Huang, Hanbing Cao, Jinshan Liu, Weihong Qiu, Zhaohui Wang · 发表于：Journal of Integrative Agriculture · 年份：2023 · DOI：10.1016/j.jia.2023.11.049 · 被引用次数：20 · 研究领域：Soil Carbon and Nitrogen Dynamics、Soil and Water Nutrient Dynamics、Soil and Land Suitability Analysis

The optimized management of crop fertilization is very important for improving crop yield and reducing the consumption of chemical fertilizers. Critical nutrient values can be used for evaluating the nutritional status of a crop, and they reflect the nutrient concentrations above which the plant is sufficiently supplied for achieving the maximum potential yield. Based on on-farm surveys of 504 farmers and 60 field experimental sites in the drylands of China, we proposed a recommended fertilization method to determine nitrogen (N), phosphorus (P), and potassium (K) fertilizer input rates for wheat production, and then validated the method by a field experiment at 66 different sites in northern China. The results showed that wheat grain yield varied from 1.1 to 9.2 t ha−1, averaging 4.6 t ha−1, and it had a quadratic relationship with the topsoil (0−20 cm) nitrate N and soil available P contents at harvest. However, yield was not correlated with the inputs of N, P, and K fertilizers. Based on the relationship (exponential decay model) between 95-105% of the relative yield and topsoil nitrate N, available P, and available K contents at wheat harvest from 60 field experiments, the topsoil critical nutrient values were determined as 34.6, 15.6, and 150 mg kg−1 for soil nitrate N, available P, and available K, respectively. Then, based on five groups of relative yield (>125%, 115-125%, 105-115%, 95-105%, and <95%) and the model, the five groups of topsoil critical nutrient levels a...