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田间试验研究4种水平的模拟氮沉降(即N0、N1、N2、N3、N4,施氮量分别为0、3、6、12、24 g/(m2.a)对早稻品种“岳优463”不同生长发育阶段的影响。结果表明,氮沉降对水稻的生长、产量及光合作用有一定的促进作用。经高氮沉降(N4)处理,水稻株高、光合速率在分蘖期分别比对照(N0)增加了45.6%和49.5%,在乳熟期比对照增加了6.4%和28.9%。氮沉降对水稻叶绿素a、叶绿素b和叶绿素(a+b)含量均表现为促进作用。乳熟期N1、N2、N3、N4的叶绿素(a+b)比N0增加了34.9%、51.5%、111.3%和143.6%。中高氮处理(N3,N4)对水稻产量的促进作用较为显著,N1、N2、N3、N4的产量分别比N0增加了1.3%、6.2%、13.0%和42.6%。随施氮水平的增加,秕谷率也增加,而产量指数和籽粒大小呈下降趋势。
In field experiments, simulated N deposition (N 0, N 1, N 2, N 3, N 4, N rates of 0, 3, 6, 12, 24 g / (m2.a) 463 ".The results showed that nitrogen deposition promoted the growth, photosynthesis and photosynthesis of rice.The plant height and the photosynthetic rate under high nitrogen deposition (N4) Control (N0) increased by 45.6% and 49.5%, respectively, and increased by 6.4% and 28.9% at milky stage compared with the control. Nitrogen deposition promoted the content of chlorophyll a, chlorophyll b and chlorophyll (a + b) The chlorophyll (a + b) of N1, N2, N3 and N4 increased by 34.9%, 51.5%, 111.3% and 143.6% more than N0 at the maturity stage, and the effect of medium and high nitrogen treatments (N3 and N4) The yield of N2, N3 and N4 increased by 1.3%, 6.2%, 13.0% and 42.6% respectively than that of N0. With the increase of N application rate, the yield increased and the grain yield decreased.