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小麦出苗后,由于受自然条件和栽培方法的影响,往往会形成各种不同类型的弱苗。为便于对症管理,这里从土壤和播种两个方面对小麦苗弱的原因进行分析。一、土壤部分1.土壤干旱。多发生于底墒不足或透风跑墒的麦田,其特点是:分蘖出生慢,叶色灰绿,心叶短小,生长缓慢或停滞(一般称之为“缩心苗”),中下部叶片逐渐变黄干枯,根少而细。管理要点:结合浇水,每667平方米追施碳铵15千克。2.土壤过湿。通常表现为叶色淡紫,分
After emergence of wheat, due to the natural conditions and cultivation methods, often will form a variety of different types of weak seedlings. In order to facilitate the symptomatic management, here from the soil and sowing two aspects of wheat seedling causes of the analysis. First, the soil part 1 soil drought. Occurred at the end of the lack of entropy or moisture running moisture of the wheat field, which is characterized by: slow birth tillering, leaf color gray green, short leaf heart, slow growth or stagnation (commonly referred to as “slender”), the lower leaves Gradually turn yellow dry, small and thin roots. Management points: combined with watering, ammonium bicarbonate 15kg per 667 square meters. The soil is too wet Usually manifested as leaf color purple, points