高产土壤条件下双季杂交稻的施钾效应  被引量:4

EFFECTS OF POTASSIUM FERTILIZATION ON DOUBLECROPPING HYBRID RICE IN HIGHYIELD SOIL

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作  者:张杨珠[1,2,3] 黄运湘[1,2,3] 邹应斌 黄升平[1,2,3] 肖铁光 肖应辉[1,2,3] 

机构地区:[1]湖南农业大学资源系 [2]湖南农业大学植物科学技术学院 [3]湖南省醴陵市农业局

出  处:《湖南农业大学学报(自然科学版)》1998年第4期305-311,共7页Journal of Hunan Agricultural University(Natural Sciences)

基  金:国家"九五"科技攻关项目

摘  要:为研究高产土壤条件下双季杂交稻不同施钾水平的效应,以肥力水平高,供钾能力较好的冲积性水稻土为供试土壤,以杂交水稻V402(早稻)和V46(晚稻)为供试作物,进行田间小区试验.结果表明,早稻生育期间土壤供钾能力比晚稻生育期间强,施钾对早稻稻谷产量和地上部分干物质总量均无正效应;而晚稻施钾对稻谷产量和地上部分干物质总量均有良好效果,二者均随施钾量提高而提高.但在施钾显著增产的范围内,施钾的效应系数仍不大,这是供钾能力较好的高产水稻土上双季稻施钾效应特性之一.各施肥处理的稻谷产量均是晚稻高于早稻,在过高的施钾量条件下,早稻成熟期体内钾素有严重的淋失现象,有待进一步研究.To study the effect of various application rates of K fertilizer in high yield soil where double cropping hybrid rice is planted,a plot experiment is conducted in K rich alluvial paddy soil. The experimental crop is V402 rice (early rice) and V46 (late rice). The results show that the soil′s K fertilizer supplying ability is stronger at early rice′s growth period than at late rice′s growth period. The application of K fertilizer has no positive effect on both the early rice′s yield and the total production of above ground dry matter. While the application of K fertilizer has positive effect on the yield and the total above ground dry matter. The yield and dry matter increase with the increasing application of K fertilizer. But in the range which the application of K fertilizer increases yield significantly,the effect coefficient of K fertilizer′s application is small. This is one of the characteristics of K fertilizer′s application effect on the highyield rice soil where the supplying ability of K fertilizer is strong. The early rice yields are more than the late rice when fertilizer is applied. And there is a serious loss of K in early rice during its maturing period when K fertilizer is over applied. This phenomenon is worth a further study.

关 键 词:杂交水稻 水稻土 施钾 肥效 双季稻 

分 类 号:S511.420.6[农业科学—作物学]

 

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