不同氮肥水平对辽星1号和辽优5238产量的影响

以辽星1号和辽优5238为供试材料,研究了不同氮肥水平对水稻产量的影响。结果表明,与N3处理相比,减少氮肥投入的15%和增加氮肥投入的15%~45%均不能显著影响辽星1号和辽优5238的产量。两个供试品种均以15 kgN/667m2为最适施氮量,能够获得较高的经济效益。氮肥农学利用率随施氮量的增加而降低,因而在生产中应避免以高施氮量获得高产。

Effect of Different Nitrogen Amount on Yield of Liaoxing 1 and Liaoyou 5238

Field experiment was conducted to study the effect of N fertilizer on the yield of japonica cultivar Liaoxing 1 and japonica hybrid cuhivar Liaoyou 5238. The results showed that compared with the N3 treatment the yield of Liaoxing 1 and Liaoyou 5238 did not changed greatly when N fertilizer reduced by 15% or in- creased by 15% -45%. The higher economic benefit was obtained when N fertilizer was applied at 15 kgN/ 667m2, which could be regarded as optimum N fertilizer application rate for both two studied cultivars. Nitro- gen agronomic efficiency decreased with the increase of N fertilizer application amount, thus, it should be a- voided that excessive N fertilizer was applied to obtain high yield.