洪湖地区莴笋有机肥料当量试验研究

Study and Test on Using Dosage of Lactuca sativa L. var. angustata Irish ex Bremer Organic Fertilizer in Honghu Area

试验表明,湖北洪湖市蔬菜产区内,土壤碱解氮含量120 mg/kg以上的田块,特别是老菜地,氮养分充足,种植莴苣(Lactuca sativa L.var.angustata Irish ex Bremer)时,可以用有机氮替代部分无机氮,其中以1/3氮(有机氮)作基肥、2/3氮(无机氮)作追肥时,氮肥供应较为合理,经济系数最高,产量及经济效益最高。较适宜的施肥方案为每667 m2施有机肥料300 kg、普钙45 kg、氯化钾7 kg作基肥,20 kg尿素作追肥。

The results showed that, in vegetable production areas in Honghu city of Hubei province, the fields especially old vegetable fields had ample nitrogen nutrient when the content of available nitrogen was under 120 mg/kg. It had a suitable nitrogen fertilizer supply, highest economic coefficient and highest yield and economic benefit when part of inorganic nitrogen（1/3 organic nitrogen as base fertilizer, 2/3 inorganic nitrogen as topdressing） was instead of organic nitrogen to plant Lactuca sativa L. var. angustata Irish ex Bremer. The suitable fertilization scheme was applied with organic fertilizer 300 kg, calcium 45 kg and potassium chloride 7 kg as base fertilizer and urea 20 kg as topdressing.