Feasibility study on one-time side-depth application of inorganic wrapped controlled-release fertilizer for seeding rice
The optimum nitrogen application rate and fertilizer application method applicable to single-season direct-seeded rice Nangeng 46 were explored,with a view to providing technical solutions for the light simplified production of rice and the efficient utilization of nutrient resources in Chongming district,Shanghai.A field experiment was conducted from June to November,2022.Five treatments were conducted:no nitrogen application,farmer's conventional fertilization,one-time fertilization,one follow-up application at tillering stage,and two follow-up applications at tillering+spike stage.The impacts of different nitrogen applications and transport methods on the growth dynamics,yield,nitrogen uptake and utilization,rice quality,and economic benefits of rice were analyze.A side-depth single fertilization technique was adopted for the main rice variety(Nangeng 46)in Chongming,Shanghai.The nitrogen fertilization mode of applying special slow-release fertilizers and keeping the pure nitrogen nutrient input at 225 kg/hm2 was able to obtain the best yield and rice quality,reducing nitrogen by 27.2%,compared with the conventional fertilization treatment by local farmers,and at the same time reducing the number of 2-3 times of fertilizer application at the late stage of the rice crop and lowering the cost by 14.0%,with a yield/input ratio of 1.94.This fertilization mode had the highest nitrogen utilization rate of 47.5%,which increased by 51.0%,compared with the conventional treatment of local farmers.The one-time side-depth fertilization technique with new fertilizer application could achieve optimal rice yield,rice quality and economic benefits at a pure N input of 225 kg/hm2.
ricenew fertilizerside depth applicationyieldnutrient use efficiencyeconomic benefit
NETL
NSTL
万方数据
