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以振杰2号(ZJ2)、登海605(DH605)和郑单958(ZD958)为试验材料,在大田条件下设置花粒期遮阴(S1)、穗期遮阴(S2)、全生育期遮阴(S3)3个遮阴处理,以自然光照条件为对照(CK),研究了遮阴对夏玉米干物质积累和氮、磷、钾吸收的影响.结果表明:遮阴后夏玉米籽粒产量和单株干物质积累量显著降低,降低程度与遮阴时期有关,表现为S3>S1>S2,其中S1、S2和S3籽粒产量平均降低61.6%、25.3%和92.8%,说明花粒期遮阴较花前遮阴对夏玉米干物质积累和籽粒产量影响更大,不同品种的变化趋势相同.夏玉米植株花前养分吸收量表现为钾>氮>磷,植株吸收总量表现为氮>钾>磷.遮阴后植株氮和磷积累量显著减少,由于遮阴后干物质较对照降低程度大于对氮、磷吸收的降低程度,各处理氮、磷相对含量有所升高;遮阴后各处理植株钾吸收量较对照显著降低,但S2处理的钾吸收降低程度大于干物质积累降低程度,钾相对含量降低,即花前遮阴对玉米钾吸收的影响大于氮和磷.
Taking ZJ2, Deng63 (DH605) and Zhengdan958 (ZD958) as experimental materials, the anthesis was set in the field under the condition of pollen stage shading (S1), spike stage shading (S2) Shading treatment (S3), shading treatments were applied to control the dry matter accumulation and N, P and K uptake of summer maize under the condition of natural light illumination (CK) .The results showed that after shading summer maize The grain yield and dry matter accumulation per plant decreased significantly, and the degree of decrease was related to the shading period. The results showed that S3> S1> S2. The average grain yield of S1, S2 and S3 decreased by 61.6%, 25.3% and 92.8% The shading period had greater influence on the dry matter accumulation and grain yield of summer maize, and the change trend of different varieties was the same. The pre-anthesis nutrient absorption of summer maize showed potassium> nitrogen> phosphorus, and the total amount of plant absorption was Nitrogen> potassium> phosphorus.After the shading, the accumulation of nitrogen and phosphorus decreased significantly, the relative content of nitrogen and phosphorus in the treatments increased due to the decrease of the dry matter in the shading was more than that in the control, After shading, the potassium uptake of all treatments was significantly lower than that of the control, but the reduction of potassium uptake by S2 was greater than that of dry matter accumulation Extent, to reduce the relative content of potassium, the influence of shading on the front flower i.e., greater than the K absorption maize nitrogen and phosphorus.