施肥与刈割对不同紫花苜蓿品种生产性能的影响

Effect of clippingand fertilization on production performance of different alfalfa varieties

在甘肃省兰州市秦王川地区研究了4个施肥处理(ck、N0P、N1P、N2P)和2个刈割次数处理(3次、4次)对甘农3号和陇东苜蓿株高和产量的影响。结果表明:苜蓿各茬株高和产量随施肥量的增加而增加;同一施肥水平下,甘农3号刈割4次年鲜、干草产量均比刈割3次的高,陇东苜蓿刈割4次年鲜草产量比刈割3次高,但刈割3次年干草产量比刈割4次的高。甘农3号在N2P和刈割4次处理下鲜草和干草产量均达到最高,分别为61 611kg/hm2和15 117kg/hm2;陇东苜蓿在N2P和刈割4次处理下鲜草产量达到最高,为39 178kg/hm2,在N2P和3次刈割处理下干草产量达到最高,为11 217kg/hm2。在试验地区甘农3号和陇东苜蓿均以N2P处理的株高和干草产量达最高。

The content and distribution of total potassium and available potassium at soil layers of 0 to 10 em,10 to 20 cm and 20 to 30 cm in the light,medium,heavy and extreme degraded alpine meadow in Tianzhu were studied. The results showed that： 1） The total potassium contents in same soil layers were significantly different at the different degeneration stages, and the variation trend was light〉 medium〉 heavy,extreme. Meanwhile,the available potassium contents in medium and heavy degraded grassland were than light and extreme degraded grassland. The available potassium content in the light degr significantly higher aded grassland was lowest. 2） In the different soil layers under same grassland degeneration level,the content of total potassium and available potassium were both decreased with the soil layers. However, the differences of potassium contents were not significant in different soil layers.