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为促进农田养分循环利用和农业生态环境健康,以粳稻品种运2645为供试材料,设计农田施用水葫芦(将晒干水葫芦按4 500 kg hm-2农田施用)和不施用水葫芦处理(对照),施N量为120 kg hm-2(LN)、240 kg hm-2(NN),研究其对水稻物质生产与分配的影响.结果表明:1)农田施用水葫芦使水稻移栽~分蘖中期、分蘖中期~拔节期、拔节~抽穗期、抽穗期~穗后20 d和穗后20 d~成熟期平均分别比对照8.6%、9.8%、12.2%、15.9%和3.1%,使得成熟期生物产量显著增加(+9.0%);2)与干物质生产量相似,水稻平均叶面积指数(LAI)和净同化率(NAR)对水葫芦处理的响应呈相似的季节性变化趋势,但NAR在穗后20 d~成熟期有所下降;3)农田施用水葫芦对水稻不同生育时期叶片、茎鞘和稻穗占地上部干重的比例影响不大;4)增加施N量能够明显增加水稻的干物质生产量;水葫芦×N的互作效应对水稻干物质生产与分配无明显影响.5)农田施用水葫芦使水稻生育前、中期干物质生产量增幅较大,对生育后期影响相对较小.图5表3参15
In order to promote the recycle of farmland nutrients and agroecological environment, the experiment was conducted in the field of watermelon cultivation (using sun-dried water hyacinth at 4 500 kg hm-2 farmland) and without applying water hyacinth The results showed that: 1) Water hyacinth applied in farmland could make rice transplanting ~ 120 kg hm-2 (LN) and 240 kg hm-2 (NN) The average number of tillers from mid-tillering stage to jointing stage to jointing stage-heading stage, heading stage-20 days after spike and 20 days after heading stage were respectively 8.6%, 9.8%, 12.2%, 15.9% and 3.1% (+9.0%); (2) Similar to the dry matter production, the responses of rice LAI and NAR to water hyacinth showed similar seasonal changes, NAR decreased from 20 d after spike to maturity; 3) The application of water hyacinth in farmland had little effect on the proportion of dry matter in upper leaves of stems and sheaths at different growth stages of rice; 4) Increase the dry matter production of rice; the interaction effect of water hyacinth × N had no obvious effect on the production and distribution of dry matter.5) Field of rice growth of water hyacinth administered before, a larger increase in the amount of mid dry matter production, relatively small impact on the late growth stage. FIG. 5 Table 3 Reference 15