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为探讨土壤对磷肥的固定强度与磷肥的有效施用条件,1980—1986年在淇县、新蔡、洛宁、浚县、郑州、商丘六个县、市,对潮土、褐土和砂姜黑土三个主要土类,先后进行了磷肥和氮磷钾配比等定位试验。一、试验设计 (一)磷肥施用周期(四年)定位试验:设五个点,每点按每亩18公斤P_2O_3,分为第一年一次施入、隔年施8公斤、四年中每年施4公斤和不施磷肥四个处理,三次重复。四年连续试验。
In order to explore the fixed strength of the soil for phosphate fertilizer and the effective application of phosphate fertilizer conditions, 1980-1986 in Qi County, Xin Cai, Luoning, Junxian, Zhengzhou, Shangqiu six counties, cities, the Chao soil, cinnamon and sand ginger Black soil three major soil types, has conducted a phosphate fertilizer and NPK positioning test. First, the experimental design (A) P fertilizer application cycle (four years) Positioning test: set up five points, each point of 18 kg per mu P_2O_3, divided into the first year once applied, every other year 8 kg, four years 4 kg and no phosphate treatment four, three times repeated. Four years of continuous testing.