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1 缺素症 1.1 缺氮 早期缺氮表现为叶片生长受阻,颜色变淡,叶脉尤甚;严重时,叶片上散布着黄绿相间的斑块或叶片失绿。茎杆细而坚韧,果实表现为“尖嘴瓜”,且颜色变淡。 持续的缺氮是引起黄瓜减产的主要原因之一,尤其是雨季,大量施用未腐熟农家肥常常导致缺氮,周为这种肥不利于植株吸收。 防治措施:施放硝酸铵及尿素等含氮的化肥。
A lack of disease 1.1 Nitrogen deficiency Early nitrogen deficiency showed obstruction of leaf growth, color fades, especially veins; severe, yellowish green leaf patches scattered on the leaves or green leaves. Stalk thin and tough, the performance of the fruit “melon”, and the color fades. Continuous nitrogen deficiency is one of the main causes of cucumber yield reduction, especially in the rainy season. Large amounts of unmanaged farmyard manure frequently lead to nitrogen deficiency, which is not good for plant absorption. Control measures: the release of ammonium nitrate and urea nitrogen and other fertilizers.