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供试材料为新西兰努伊多年生黑麦草,1985年10月1日按每公顷15公斤的播量播种,行距30厘米。播前每公顷施过磷酸钙和钙镁磷肥各250公斤、石灰500公斤作基肥。试验设封闭期(最后一次刈割或放牧到种子成熟的时期)不同处理4个(3月19日、3月29日、4月8日、4月18日),8次重复。小区面积7米~2。入冬前施提苗肥一次(每公顷硫酸钾75公斤、尿素100公斤);次年元月第一
The test material was perennial ryegrass in Niue, New Zealand. Seeds were sown at a rate of 15 kg per hectare on October 1, 1985 at a distance of 30 cm. Per hectare before sowing applied calcium phosphate and calcium magnesium phosphate 250 kilograms, 500 kilograms of lime as a base fertilizer. In the experiment, four treatments (closed on March 19, March 29, April 8, April 18) and 8 replications were carried out during the period of closing (the last period of cutting or grazing until the seed matured). Residential area of 7 m ~ 2. Shidi Miao fertilizer once before winter (75 kg of potassium sulfate per hectare, urea 100 kg); the first year of January