石灰性土壤水稻锌临界值及施锌效果研究

在氮、磷、钾肥用量处于最佳施肥量,土壤有效锌含量1.0-1.5 mg/kg试验条件下,水稻增施锌肥后,成穗数、每穗实粒数、千粒重、株高、穗长等均有不同程度的增加,产量明显提高,以施硫酸锌22.5 kg/hm^2的处理最高,平均比不施锌处理增产12.7%。不同类型土壤表现一致,但潮土施锌增产幅度明显高于水稻土,且以成穗数增加为主,水稻土处理每穗粒数明显高于潮土处理。通过回归分析,水稻适宜施锌量为21.5-23.0 kg/hm^2,产量可达9 300-9 800 kg/hm^2。水稻土壤有效锌临界值指标1.48 mg/kg。

Study on the Critical Value of Zinc and Effects of Zinc Fertilizer on Rice in Calcareous Soil

Under test condition of the nitrogen, phosphorus, potassium in the optimum amount of fertilization and the soil available zinc content of 1.0-1.5 mg/kg, the ear number, grains per panicle, 1000-grain weight, plant high, ear length and yield increased with the increase of zinc fertilizer. The results showed that the yield of rice was highest when the amount of zinc sulfate was 22.5 kg/hm^ 2, it increased by 12.7% compared to the control. The trends of different soil were similar. The yield in fluvio-aquic soil increased more than that of paddy soil, the ear number in fluvio-aquic soil was higher, but the grains per panicle in paddy soil was higher than that of fluvio-aquic soil. Regressive analysis showed that the optimum amount of zinc sulfate was 21.5-23.0 kg/hm ^2, the yield reached 9300-9800 kg/hm^2. The critical value of soil available zinc deficiency for rice was 1.48 mg/kg.