摘要
杂交早稻威优49亩产450千克左右,每亩平均吸收氧化钾7.880千克,其中79.16%为土壤供钾。杂交早稻一生中前期吸钾量占38.60%,中期占42.29%,后期占19.11%.群体总吸钾量与总吸氮量呈1∶1的关系.肥料钾的利用率为28.12%.施钾明显促进抽穗前茎鞘醣的积累和抽穗后茎叶醣向谷粒的转运.施钾对产量的影响主要表现为总粒数、实粒数和千粒重的增加。在本试验中等供钾土壤条件下,杂交早稻亩施5千克氧化钾的增产效应最大.
The total amount of the potassium absorption was 7.879 kg/mu when thegrain yield of the early hybrid rice,v49,was about 450kg/mu.And the amountof potassium supplied by soil was 79.16% of the total amount.The amount ofpotassium absorption was 38.60% in the early stage,42.29% and 19.11% in themiddle and later stages respectively.The total amount of nitrogen absorptionand potassium absorption was in the ratio of one to one.The utilization rateof the potassium applied was 28.12%.The carbohydrate amount in leaf-sheathand stem before heading and the translation rate of the carbohydrate afterheading increased when potassium was applied,The higher yield promoted bypotassium was because of the increase of the number of filled grain and thegrain weight.Under the condition of middle level of soil potassium,the potassiumapplication with 5 kg/mu was most efficient for the yield increase of earlyhybrid rice.
出处
《江西农业大学学报》
CAS
CSCD
1990年第1期54-59,共6页
Acta Agriculturae Universitatis Jiangxiensis
关键词
杂交早稻
吸钾量
产量
Early hybrid rice
Amount of potassium absorption
Carbohydrate
Grain weight
Number of filled grain
