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以Q优6号为材料,分析了不同地力条件下不同施氮水平对水稻叶片SPAD值和产量的影响。结果表明,水稻产量与表观供氮量存在极显著的曲线相关,且当表观供氮量在575.27 kg/hm~2时,Q优6号产量较高;不同处理下各生育时期SPAD值大小顺序为抽穗期>拔节期>成熟期,且差异主要表现在抽穗期和成熟期;拔节期和抽穗期不同地力和施氮水平下水稻冠层4张叶片各自的差异主要表现在顶3叶和顶4叶上,可以利用两者的SPAD值作为参数进行氮素营养诊断;SPAD值与表观供氮量之间存在显著线性相关,且采用SPAD_(L3×L4/mean)进行拟合时效果更好,均达到极显著水平。获取水稻叶片SPAD值次级指标可以实现对田块速效氮含量的估计。
With Qyou 6 as the material, the effect of different nitrogen application rates on SPAD value and yield of rice leaves under different soil fertility conditions was analyzed. The results showed that there was a very significant curve correlation between rice yield and apparent nitrogen supply. When the apparent nitrogen supply was 575.27 kg / hm ~ 2, the yield of Qyou 6 was higher. Under different treatments, the SPAD value The order of the size was heading stage> jointing stage> maturity stage, and the differences were mainly in the heading stage and maturity stage. The differences of the four leaves in the rice canopy at jointing and heading stages under different soil fertility and nitrogen application were mainly in the top 3 leaves And top 4 leaves, we can use the SPAD value of the two as a parameter to diagnose nitrogen nutrition. There is a significant linear correlation between SPAD value and apparent nitrogen supply, and when SPAD_ (L3 × L4 / mean) The effect is better, all reached the extremely significant level. Obtaining the secondary index of rice leaf SPAD value can estimate the available nitrogen content in the field.