红壤果园白三叶草最佳播种量及其对杂草的抑制效果

The optimum seeding rate of white clover(Trrifolium repens L.)and its effect on inhibiting weeds in reddish orchard of south China

采用大田试验方法,研究了不同播种量条件下红壤果园覆盖作物生长发育及其对果园杂草的抑制效应。结果表明：白三叶草出苗数、草层高度和鲜草产量均随播种量增加呈上升趋势,而茎粗、叶片SPAD值和单株鲜重则呈下降趋势。播种量为〈15.00kg/hm2时,鲜草增幅较大,而播种量为15.00~18.75kg/hm2时增幅减小。播种量为13.97kg/hm2种子产量最高,播种量为15.00kg/hm2时越夏率最高。说明了在丘陵红壤区幼龄果园白三叶草的适宜播种量为13.97~15.00kg/hm2。

A field experiment was performed to investigate the optimum seeding rate as well as its effects of cover crop on inhibiting weeds in reddish orchard of south China. The results showed that the seedlings, thick of white clover were increasing with the increasement of seeding rates, however, the opposite trends were observed in stem diame- ter, SPAD and the fresh weight of single plant. A remarkably increasing range of fresh weight of white clover was observed at a seeding rate less than 15.00 kg/hm2 , but a smaller range was observed at the seeding rate of 15.00~ 18.75 kg/hm2. The seed yield and over summer rate of white clover increased with an appropriate seeding rates but a decreased trends with a larger seeding rate. The highest seed yield and over summer rate were gained at a seeding rate of la. 97 kg/hm2 and 15.00 kg/hm2 respectively. Hence, the appropriate seeding rate of white clover was 13.97 ~15.00 kg/hm2 in reddish orchard of south China.