黔两优58施用氮、磷、钾肥及栽培密度的效应

摘要

Using split - plot experimental design, the effect of nitrogen, phosphorus and potassium on “Qianliangyiu 58” rice was carried out in the current work. The results showed that rice spike neck blast highly inhibited the yield, regardless of the use of N, P, K fertilizer. The loss rate (％) of this disease was described as - 17.0 +3.69 N+2.82 P2 O5, and the best density was 8 000/667 m2.%利用裂区试验设计研究水稻品种黔两优58水稻不同种植密度和施用氮、磷、钾的效应.主处理为密度,设8 000株/667 m2、10000株/667 m2、12000株/667m23个水平;副处理采取3414+2试验方案,以氮、磷、钾肥3个因素为基础,4个水平,16个处理.结果表明:黔两优58水稻在正安县灰黄泥沙田当年的栽培条件下,氮、磷、钾肥的最大施用量为4.66 kg N/667 m2、5.73 kg P2O5/667 m2和7.78 kg K2O/667 m2.若不注意防治穗颈稻瘟病,则施肥的增产作用有可能被病虫害的加重抵消;穗颈稻瘟病损失率(%)=-17.0+3.69 N+2.82 P2O5;栽培密度以8 000株/667m2为宜.