共查询到20条相似文献，搜索用时 15 毫秒
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P. Benecke 《植物养料与土壤学杂志》1983,146(6):798-799
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Evalution of critical Zn contents of oats and wheat The minimum Zn content of oats and wheat required for high grain yields is determined in water culture experiments. Zn contents of above ground parts of plants at the beginning of tillering are closely correlated with grain yields (r2 about 80 %) and thus suitable to characterize the Zn status. At least 25 ppm Zn in the dry matter of plants at the beginning of tillering are necessary for highest yields. This value can also be derived from 290 Schleswig-Holstein field samples. No influence of increasing contents of other nutrient elements on the critical Zn content can be found. 相似文献
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A. Krauss 《植物养料与土壤学杂志》1970,125(1):64-64
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A. Krauss 《植物养料与土壤学杂志》1969,123(3):244-244
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Determination of plant analysis criteria characterizing the magnesium nutrition of oats, spring wheat and maize Cereal plants from pot trials were analyzed for criteria of optimal Mg nutrition. The critical Mg concentration in dry matter of aerial parts from oats and spring wheat at the beginning of the shooting stage was found to be 1.8 and 1.3 per mille Mg respectively. The critical Mg concentration with maize is about 2,2 per mille in dry matter of yount leaves at tasseling stage. Because the Mg content of oats (based on dry matter) decreases significantly during the shooting stage, it seems advisable to have additional data (Mg content of green matter, Mg/N ratio, Mg/Ca ratio) which are less influenced by plant age. The Mg/Ca ratio appears to be well suited for evaluating the nutritional status of cereals. Minimum critical Mg/Ca ratios (based on per mille contents) are 0,23 for spring wheat, 0.3 for oats and 0.4 for maize. 相似文献
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