割草地羊草叶面施肥的初步研究

THE STUDIES ON THE SPRAYING FERTILIZER UPON LEAVES OF LEYMUS CHINENSE ON CUTTING GRASSLAND

对羊草割草地进行叶面喷施硼基微肥、复合晶Ⅱ号和复合晶Ⅲ号肥料的结果表明,三种复合肥料对羊草的Chl(a+b)含量、Chlb/a比率、叶面积及每株地上部干重均有影响,影响程度因施肥的种类、剂量、浓度及喷施次数而异。无论从叶面积的增加值还是从每株地上部干重增加值来看,均以复合晶Ⅲ号效果最好,并以采用12g/20m^2的剂量、用0.5％的浓度喷施2次或用0.7％的浓度喷施1次的方法为宜,可以明显提高羊草的叶绿素含量、叶面积和单株干物质产量。

This article concerns with the experiments of spraying Boron—based—minor fertilizer, Crystal complex Ⅱ and Crystal complex Ⅲ upon leaves of Leymus chinense on cutting grassland. The results indicated that these fertilizers affect the content of Chl (a+b), ratio of Chlb/a, leaf area and dry weight of the part of L. chinense above soil. The different the dosage, concentration and the kind of fertilization and the frequency of spraying are, the different the degree of the effect is. We suggested that Crystal Complex Ⅲ have the best effect which based on whether the increment of leaf area or the increment of dry weight of the part above soil, and Crystal complex Ⅲ with dosage of 12g/20m^2 and 0.5% Concentration spraied two times or 0.7%. concentration spraied just one time is the best method which would increases the chloropyll content, leaf area and dry matter products of individual plant of L. chinense evidently.