论文部分内容阅读
当苜蓿群体密度降低时,每株的茎数会增加,这可补偿因密度下降至引起的产量下降。当密度降致临界以下时,这种补偿就不足以维持原有的产量水平。细胞分裂素能促进其植物茎的生长,本研究的目的是研究细胞分裂素对苜蓿生长发育、产量、质量的影响。使用2种细胞分裂素:激动素和6-苄基腺嘌呤(BAP),以不同浓度叶面喷施不同密度的苜蓿。试验表明,使用细胞分裂素后增加了单株茎数、茎长、单株叶面积。这与产量的增加呈正相关(r>0.74)。使用细胞分裂素后,单株干重(DM),在温室试验中增加35％,在大田增加79％。这种促进作用在高密度和低密度群体中效果相似。在温室试验中,刈割后3d和7d利用的产量分别比刈割后立即利用减产9％和15％。在大田中施用细胞分裂素品质未受影响,但在温室的试验中品质下降(粗蛋白平均减少13g/kg,酸性纤维增加29g/kg)。使用细胞分裂素于苜蓿残茬上能增加每株茎数和干物质,这可能是大田生产上增产的一种方法。
When the population density of alfalfa decreased, the number of stalks per plant increased, compensating for the decline in yield due to the decrease in density. When the density drops below the threshold, this compensation is not sufficient to maintain the original production level. Cytokinin can promote the growth of plant stems, the purpose of this study is to study cytokinin alfalfa growth, yield, quality. Two different cytokinins, kinetin and 6-benzyladenine (BAP), were used to spray alfalfa at different densities. Experiments show that the use of cytokinin increased the number of stems per plant, stem length, leaf area per plant. This is positively correlated with the increase of yield (r> 0.74). After using cytokinin, the dry weight per plant (DM) increased 35% in the greenhouse test and 79% in the field. This promotion is similar in high-density and low-density groups. In greenhouse experiments, the yields utilized 3d and 7d after mowing were reduced by 9% and 15%, respectively, immediately after mowing. The quality of cytokinin was not affected in the field, but decreased in the green house (average reduction of crude protein by 13 g / kg and acid fiber by 29 g / kg). The use of cytokinin on alfalfa stalks can increase stem number and dry matter per plant, which may be a way to increase production in the field.