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植物生长需要各种元素,其中除大量元素碳、氢、氧(由空气和水供应)氮、磷、钾、硫、钙、镁和铁外,还需要微量元素锰、硼、铜、锌、钼、氯,这些都要从土壤肥料中获得。缺乏某元素就会引起植物黄叶、扭曲、丛枝等生理病害,究竟缺乏何种元素会引起花木不正常状态?如何判断?现予以介绍:缺氮:基部老叶黄化、脱落,植株呈淡绿至黄绿,叶片变小,植株新梢延长轻度受阻。缺磷:基部叶片黄色,叶片失绿程度不如缺氮严重。植株深绿,叶柄紫红色,叶片变薄,变小,植株矮小,果实部分出现坏死斑点。缺钾:基部老叶呈现白色缺绿斑痕,叶脉间和叶边缘叶尖干枯。叶片因生长不均匀形成杯状弯卷或皱缩,随生长期延长呈现“灼伤”状,茎节细短,严重时顶枯,植株倒伏。缺硫:顶端嫩叶叶脉黄绿色缺绿症,叶呈现红或紫色。缺钙:顶端嫩叶变黄呈钩状,后从叶尖和叶
Plant growth requires a variety of elements, including trace elements such as manganese, boron, copper, zinc, manganese and iron, in addition to a large number of elements such as carbon, hydrogen and oxygen (supplied by air and water) Molybdenum, chlorine, these have to be obtained from soil and fertilizer. The lack of an element will cause yellow leaves, twisting, Cong Zhi and other physiological diseases, what elements of the lack of flowers and trees can cause abnormal state? How to judge? Will be introduced: Nitrogen deficiency: yellow leaves of old base, shed, Light green to yellowish green, leaves smaller, plant shoots extended slightly blocked. Phosphorus deficiency: the base leaves yellow, green leaves less than the degree of serious lack of nitrogen. Plant dark green, petiole fuchsia, leaves thinner, smaller, short plants, necrosis of the fruit part of the spot. Potassium deficiency: the base of the old leaves showed a lack of white green marks, leaf veins and leaf edge between the tip dry. The leaves were curled or shrunken due to the uneven growth, showing “burns” with prolongation of growth period. The stems were short and thin, and when the leaves were severely dead, the plants lodged. Lack of sulfur: the top green leaf veins yellow green lack of disease, the leaves appear red or purple. Calcium deficiency: the top leaves turn yellow hook, from the tip and leaves