施N量和密度对水稻双株秧的效应分析

EFFECTS OF AMOUNTS OF APPLIED NITROGEN AND TRANSPLANTING DENSITY IN TWIN-SEEDLING PADDY

通过对水稻双株秧在不同施N量和不同栽插密度下的研究，结果表明：以施用90g／m2N肥、栽240苗／m2处理的有效穗和经济产量最高。就有效穗和经济产量两个经济性状来说，施N量和密度间分别存在极显著和显著的互作效应。在施N量低时（如45g／m2），要有较高的栽插密度（如270苗／m2），才有较高的有效稳和经济产量。因此，在施N量低时应加大栽插密度，以保证足够的有效穗。施N量和密度对颖花数、结实率、株高均无显著影响。因此，栽双株秧必须有较高的N肥施用量和适宜的基本苗数，最后才可能有一个理想的产量。

The effect of amounts of applied nitrogen(AAN)and transplanting density (TD) on twin-seedling paddy were studied in this cxperiment. The results showed that the amounts of effective ear and economic yields of the treatment of AAN 90g/m2、TD 240 seedlings/m2 were the highest than other treatments. As for amounts of effective ear and economic yields, both AAN and TD had significant interaction effect at p/0.01 and p<0.05 level respectively. At AAN 45g/m2, the hest TD level for highest amounts of effective ear and econornic yields was 270seedlings/m2. Therefore, a bigger TD should be combined with a low AAN in order to get enough amount of effective ear for higher economic yields. AAN and TD didn't have significant effect on spikelet amounts per ear, bearing percentage and plant-height. As a result, twin-seedling paddy must have higher AAN and suitable basic seedlings number in order to have a ideal yield.