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涟水地区每年冬绿肥面积都在50万亩左右,用于旱地作物的约占二分之一;夏播绿肥也有40万亩,大部分用作三麦基肥。目前绿肥利用上存在的主要问题是掩青期偏迟,其目的是为了让绿肥多生长几天,争取较多的鲜草量。实践表明,绿肥多长几天,鲜草量固然增加很多,增产效果却并不是相应地提高,而是相反地降低了。从春玉米利用冬绿肥来看,掩青期相差10余天,适时掩青的比迟掩的,每亩多收玉米
Lianshui area annual green manure area is about 500000 acres, about half of the dryland crops; summer sowing green manure also has 400000 acres, most of the three wheat-based fertilizer. At present, the main problem existing in the utilization of green manures is to delay the greening period. The purpose is to let the green manure grow more for a few days and strive for more fresh grass. Practice shows that the number of green manures for a few days, although the amount of fresh grass increased a lot, the yield increase is not a corresponding increase, but on the contrary reduced. Use of winter maize from the spring corn point of view, cover the difference between more than 10 days green, timely cover more than the late retreat of green, more than corn per acre