春玉米对氮磷钾养分的吸收与分配

研究了春玉米不同类型品种和不同生产水平下对氮、磷、钾的吸收与分配规律。结果表明，氮、磷、钾的吸收比例在紧凑型为１．００：０．１８：１．５７；在平展型为１．００：０．２８：１．５６．每生产１００ｋｇ籽粒，紧凑型所需的氮磷钾数量为：２．１４，０．３９，３．３６ｋｇ；在平展型则是１．９２，０．５４３，３．００ｋｇ，对氮磷钾的吸收高峰期在拔节至吐丝期间，但因品种类型和栽培方式等不同而有所差异，积累在茎叶等营养器官的养分，在器官衰老过程中逐渐向籽粒转移，但茎杆和穗轴中的钾含量相对保持稳定，不同器官中养分的积累与再分配也因品种类型和栽培水平而异。

Studies on absorption and distribution of N,P and K by spring maize in southern China

Law of absorption and distribution of N,P and K by different types of spring maize un-der different productive level was studied.The results showed that absorbing ratio of N,P and K is1.00 :0. 184:1.57 for the cultivar with erect leaves,and 1.00 : 0.283 :1.56 for the cultivar with flat leaves respectively.Quantity of N,P and K needed for producing 100 kg of grain is 2.14,0.394,3. 36 kg and 1.92,0. 543,3. 00 kg in above two types of cultivars respectively. Maximum ab-sorbing rate of three nutrients accued in the duration from stem elongation to earing stage,with variance in different cultivars and planting methods. The nutrients accumulated on vegetative or-gans was transfered into grain gradually by senescence of plant,but K in stem and cob maintained stable relatively. The model of accumulation and redistribution of nutrients in different organs was depandance on types of cultivars and productive level.