不同施肥水平对粤北坡岗地宿根糖蔗干物质积累和产量的影响

Effect of different NPK level on ratoon sugarcane dry matter accumulation and yields in sloping soil of Northern Guangdong

在粤北翁源坡岗地采用"3414"试验方案,开展不同施肥水平对宿根糖蔗干物质积累和产量影响的研究。结果表明,甘蔗根系干物质积累动态比较平稳,不同施肥水平间差异不明显。甘蔗地上部干物质积累动态除不施肥处理和不施氮处理外,其他处理均呈快速上升趋势。在氮磷钾三要素中,磷和氮是高产甘蔗的主要养分限制因素,钾素不是粤北坡岗地高产甘蔗的主要营养限制因子。在14个施肥水平处理中,施肥效果最佳的是N2P2K2处理,其次是N2P2K1处理。氮肥过量的增产效果不明显。

By using the method of ＂3414＂field trials in sloping soil of WengYuan, Northern Guangdong, the effects of different NPK level on ratoon sugarcane dry matter accumulation and yields were studied. The results obtained were as follows： Dynamic of sugarcane root dry matter accumulation showed a smooth curve, there were no significant difference among different treatments of NPK level. Dynamic of sugarcane shoot dry matter accumulation showed a quickly ascending trend, except for the no NPK treatment and no N treatment. For the high yields sugarcane, P2O5 and N were the primary restricting factor, P2O5 was the second, and K2O was not the primary restricting factor in sloping soil of Northern Guangdong. Among all 14 treatments, N2P2K2 fertilizing level had the best effect on sugarcane yields, then was the N2P2K1. Excessive N level had no obviously effect on sugarcane yields.