不同施肥量、种植密度因素下饲用甜高粱生育动态及产量优化

Feeding Sweet Sorghum Growth Dynamics and Yield Optimization in Different Fertilizer and Density Factors

探讨了不同施肥量、种植密度因素对饲用甜高粱[Sorghun bicolar(L.)Moench var.succharafumKouern]生育动态和全株鲜重产量的影响。结果表明,在8月以后适量追肥可以促进株高和叶片的生长,增加饲用甜高粱的全株鲜重,而种植密度的影响不明显;7月下旬各处理组合的单株茎数减少,以高密度处理的降幅最大,达到每株2个。由回归方程优化出饲用甜高粱种植最佳的施肥量、种植密度组合为施肥总量906.18 kg/hm2,种植密度17.5万株/hm2,此时鲜重产量达60.73t/hm2,施肥量与最终鲜重产量的相关达极显著差异水平,而种植密度与鲜重产量的相关未达到显著差异水平。

Effects of different fertilizer and planting density factors on feeding sweet sorghum＇s[Sorghun bicolar（L.） Moench var.succharafum Kouern] growth dynamics and full plant yield optimization were investigated.The results showed that fertilizer could promote the growth of plant height and leaf age,increase the fresh weight of feeding sweet sorghum after August,while there was no significant effect on planting density;In late July the number of stems per plant of each treatment reduced,and high-density treatment had reduced 2 stems per plant.Saw from the regression equation,the best combination of fertilizer application amount 906.18 kg/hm2 and planting density 175,000 plant/hm2 were optimized,at this time the fresh weight of output reached 60.73 t/hm2.Correlation coefficient of fertilizer quantity and fresh weight reached significant level,the planting density was positively related to yield,but not significantly.