播期和播量对橘园间作下山黧豆产量及农艺性状的影响

在橘园间作条件下,采用裂区试验设计,经连续两年试验,研究了不同播种期、播种量对豆科绿肥山黧豆(Lathyrus sativus)鲜草产量、种子产量及农艺性状的影响。结果表明,1)播期、播量对山黧豆鲜草和种子产量均有显著影响(P<0.05),播量影响大于播期;2)山黧豆的鲜草和种子产量随播期推迟显著降低(P<0.05),9月20日播种的鲜草产量最高,达29 406.0 kg·hm-2,种子产量则以9月30日播种的最高,为1 616.1 kg·hm-2。早播(9月播种)时,株高、单株分枝数、单株根瘤数、结实率和千粒重等农艺性状均优于晚播(10月播种);3)播量为45.0 kg·hm-2时,其鲜草和种子产量均最高,播种量过大对产量和农艺性状均有负向作用。综上,山黧豆在四川西充与橘园间作下的适宜播种期在9月,最佳播种量为45.0 kg·hm-2。

Effects of sowing date and sowing rate on yields and agronomic traits of grass pea intercropped with citrus

A consecutive two-year split-plot experiment was carried out to study the effects of different sowing date and sowing rate on fresh grass yield, seed production and agronomic traits of grass pea (Lathyrus sativus) intercropped with citrus. The results showed that sowing date and rate had significant effects on fresh grass yield and seed yield of grass pea (P<0.05), and the effect of sowing rate was greater than that of sowing date. Fresh grass yield and seed yield of grass pea decreased prominently as the sowing date postponed (P<0.05). The highest fresh grass yield (29 406.0 kg·ha-1) and seed yield (1 616.1 kg·ha-1) were obtained from sowing on 20th and 30th September, respectively. The agronomic traits including plant height, branch number per plant, nodule number per plant, ripening rate and thousand seed weight with the treatment sowing on September were better than those with the treatment sowing on October. Maximum yields occurred with an intermediate sowing rate of 45 kg·ha-1, and the effect of excessive sowing rate on agronomic traits and yields of fresh grass and seed were negative. In general, the most suitable sowing date was September and sowing rate was 45 kg·ha-1 for grass pea. intercropped with citrus in Xichong County, Sichuan Province