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.%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 accu-mulation 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.
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