甬优12对N、P、K养分需求规律及施肥效应模型研究

为探明甬优12对N、P、K养分的需求规律和互作机制，明确肥料施用量与产量的关系，充分发挥甬优12的增产潜力，采用“3414”试验设计对其N、P、K养分需求效应进行了田间试验。结果表明，甬优12施用N、P、K后一般可增产20%以上，对N、P、K养分需求呈幂次函数变化规律，并且N+P+K（M）整体维度需求量明显大于N、P、K单维度需求量之和，其数学模型分别为Y=-0.7744N2+18.565N+510.01（r=0.9634*），Y=3.0931P2-8.6161P+604.66（r=0.9999**），Y=-3.3975K2+35.733K+521.45（r=0.9841*）；Y=-0.1239M2+8.4834M+489.36（r=0.8010**）。通过对上述模型和通用N、P、K比例分析，甬优12对N+P+K组合互作最佳需求量为34 kg/667 m2，即纯N 14 kg、P2O57 kg、K2O 13 kg，其超高产栽培应在整体维度最佳需求量模型的基础上，加大有机肥配套和微量营养的合理促成，以健全群体与个体的关系，推动攻大穗、保多穗的超级栽培预期实现。

The Requirement Rule of N,P, K Nutrient and Fertilization Effect Model of Yongyou 12

The “3414” application design of N, P, K nutrient was tested in rice field to provide the optimum application formulation for hybrid rice Yongyou 12. The results indicated that the yield could increased by 20% at least with N, P, K application. The re-quirement of N, P, K followed a power function relationship and the whole dimension requirement of N+P+K (M) was more than the sum of each single dimension requirement, followed by mathematical models: Y=-0.7744N 2+18.565N+510.01 (r=0.9634*), Y=3.0931P2-8.6161P+604.66(r=0.9999**), Y=-3.3975K2+35.733K+521.45(r=0.9841*), Y=-0.1239M2+8.4834M+489.36(r=0.8010**). The highest yield could be obtained when application amount of pure N, P2O5 and K2O was 14 kg, 7 kg and 13 kg per 667 m2 in the test according to the models. Thus, in order to achieve optimum relationship between group and individuals and to produce more and large panicles, the super high yield cultivation of Yongyou 12 should base on the whole dimension requirement model and supple-mented by organic fertilizer and micronutrient.