摘要
研究灌溉时期和灌溉量对紫花苜蓿产量、质量、耗水量和蒸散率的影响。结果表明:第1、2茬紫花苜蓿的产量随灌水量的增加而增加,第1茬灌溉返青水+分枝期灌水、第2茬刈割后5 d灌水产量较高;第3茬紫花苜蓿产量随灌水量的增加而降低;3茬紫花苜蓿的叶茎比随灌水量的增加而下降,因此,建议北京地区种植紫花苜蓿应在第1茬返青期+分枝期和第2茬刈割初期灌水,第3茬应少灌水或不灌水。紫花苜蓿各茬的耗水量随水分供应量的增加而增加;在适当水分条件下紫花苜蓿蒸散率最小,表现为第1茬紫花苜蓿在返青6 d灌水的蒸散率最低,为278.53,第2茬刈割后5 d灌水的最低,为360.58,第3茬不灌水处理最低,为420.56,3茬紫花苜蓿刈割后5 d+分枝期灌水的蒸散率最高。
Effect of irrigation on yield,quality,water consumption,vapor rate of Medicago stiva cv.Queen was studied.The result showed that the yields of first,second and third harvests were increased under irrigation.However,the yield of third harvest was reduced.On the base of 50 mm irrigation in re-greening phase,the yield of first harvest of the plots irrigated in ramification stage was greater than that of on the sixth day after re-greening.And the yield of plots irrigated on!the fifth day after first harvest was higher than that irrigated in ramification stage.The leaf to stem rates of three harvests were decreased under irrigation treatment.So it could be suggested that irrigation should be performed mainly in re-greening and ramification stages after first harvest and early regeneration stage after second harvest.The water consumption of each harvest increased along with irrigation.The evaporation rate could reach the minimum under the proper water supplement.The time of minimum evaporation rates of three harvests varied under the different water treatment:irrigated on the sixth day after re-greening for the thirst cutting,on the fifth day for the second cutting and no irrigation for the third cutting.
出处
《草原与草坪》
CAS
2007年第1期38-41,共4页
Grassland and Turf
基金
北京市科委"优质高产紫花苜蓿生产关键技术研究"(H012010290112)项目资助
