【摘要】 为了为玉米科学施肥、获得高产提供理论依据,研究了不同水、肥条件下玉米干物质积累和N、P、K素吸收规律。研究结果表明:玉米在生育期间的干物质积累速度总体表现出慢-快-慢的规律;玉米籽粒和叶片对N素的需求最高,茎部对K素具有较强的吸收能力和需求,根部吸收积累P素的能力最强;随着施肥量、灌水量的增加,玉米植株体内N、P、K素含量总体上呈增加趋势;水分条件对N素吸收的制约作用最大,P素次之,对K素吸收的制约作用最小;增加灌水和施肥量对籽粒干物质积累的影响大于对其它器官的影响。更多还原

【Abstract】 In order to provide a theoretical basis for the scientific fertilization and high yield of maize production,the author studied the rules of N,P,K absorption and dry matter accumulation in maize plants under different water and fertilizer conditions in arid area.The research results indicated that:the speed of dry matter accumulation in maize growth and developmental period showed the rule of "slow-fast-slow"in general; the grain and leaf of maize had the highest requirement for N,the stem of maize had stronger K absorption capacity and higher requirement for K,and the root of maize had the strongest P absorption and accumulation capacity; when fertilizer application rate and irrigation amount increased,the contents of N,P and K in maize plants generally exhibited an increasing trend; the water condition had the greatest restrictive effect on N absorption of maize plants,while it had the weakest restrictive effect on K absorption; the increase in irrigation amount and fertilizer application rate had a greater influence on dry matter accumulation in grain of maize than that in other organs of maize.更多还原