施肥量对甜菜产量和生理指标的影响

试验结果表明,为获得2.8～3.0t/亩块根产量,亩施肥量以N8kg、p_2O_59.6kg、K_2O8kg为宜;甜菜含糖率与施肥量呈负相关(r=-0.5484),但未达显著水平;甜菜的NAI与施肥量呈正相关(r=0.9909)。每亩N10kg、P_2O_5;12kg、K_2O10kg处理和N8kg、P_2O_59.6kg、K_2O8kg处理群体发育良好,LAI保持在3.0以上的时期长达45天以上,并有较强的净光合生产率,有利于产量形成;甜菜单株干物重与施肥量呈正相关(r=0.9600)高肥处理虽然生物产量高,但因T/R比高,叶部徒长,分配率低,而导致经济产量低。

Effect of Amount of Fertilizer Applicated on Yield and Physiological Indices in Sugar Beet

The experimental results indicated that the optimum amount of fertilizer applicated 8 kg N, 9.6kg P2O5 and 8kg K2O/mu, 2.8 ~3.0t/mu of sugar beet root were obtained. Sugar content was negatively correlation to the amount of fertilizer applicatcd, r= -0.5484, but not significant. LAI was positively correlation to fertilizer amount, r = 0.9909 . Under the fertilizing level of 10kg N, 12kg P2O5 , 10kg K2O and 8kg N, 9.6kg P2O5 , 8kg K2O/mu, the LAI which was more than 3.0 lasted 45 days or more, the plants had higher photosynthetic rate and were available for high yielding. Dry matter of individual plant was positively correlation to fertilizer applicated, r=0.9600 . In the treatments of heavy fertilization, the biological yield was high, but the crown overgrow, T/R ratio was high, the partitioning ratio to roots and the economic yield were low.