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为完善双季稻超高产栽培技术体系 ,以湖南省醴陵市高产稻田土壤——河沙泥为供试土壤 ,杂交早稻V40 2和杂交晚稻 V6 44为供试作物 ,对不同施磷水平的杂交稻和土壤效应进行了研究 .结果表明 ,在高产土壤条件下 ,施磷仍能促进水稻提早分蘖 ,增大水稻生育前期的干物质积累量和对氮、磷、钾的吸收量 ,但对水稻中、后期的干物质积累和氮、磷、钾的吸收无促进作用 .施磷处理水稻一生中地上部干物质总量和稻谷产量与不施磷处理无明显差异 .施磷的增产效应系数低是高产稻田土壤的重要肥力特性之一 .在这样的土壤条件下水稻施磷量不应依据施磷效应曲线来确定 ,而应依据水稻生产的目标产量和生产单位重量稻谷的需磷量来确定 .依据本试验结果 ,早、晚稻生产 1 0 0 kg稻谷平均吸磷量分别为 0 .32 6 kg和 0 .35 5 kg.比照早、晚稻稻谷产量分别为 7991 .5 kg/hm2 和775 3.9kg/hm2 ,则早、晚稻施磷量应分别为 2 6 .0 5 kg/hm2和 2 7.5 2 kg/hm2 .
In order to improve the super-high-yield double-cropping rice cultivation system, the high-yielding paddy soil-river sand in Liling City of Hunan Province was used as test soil, hybrid early rice V40 2 and hybrid late rice V6 44 as tested plants, Rice and soil effects were studied.The results showed that phosphorus could promote early tillering of rice and increase dry matter accumulation and nitrogen, phosphorus and potassium uptake of rice at early growth stage under high yielding soil conditions, The accumulation of dry matter and the absorption of nitrogen, phosphorus and potassium did not promote in middle and later stages.The total dry matter content and the yield of rice in the treatment of phosphorus application had no significant difference with the no phosphorus application in the whole life. Is one of the important fertility characteristics of high-yielding paddy soils.The phosphorus content of paddy under such soil conditions should not be determined on the basis of phosphorus application curve, but should be determined based on the target yield of rice production and the required phosphorus content of paddy According to the results of this experiment, the average P uptake of rice in the early and late rice production was 0 .326 and 0355 kg, respectively. Compared with the late rice and the late rice, the yield of paddy rice was 7991.5 kg / hm2 and 7 75 3.9kg / hm2, the amount of phosphorus application in early and late rice should be 26.050kg / hm2 and 25.52kg / hm2, respectively.