| Hevea brasilensis nutrition diagnosis of traditional sampling time is 7-9 months each year to conduct, due to the lagged effects of indoor laboratory analysis, the results of their analysis can not be timely guidance for the year rubber tree fertilization; while post-September by the fertilization effect of rubber tree nutrition situation will change, so the year before diagnosis with the guidance of the second year of the beginning of the rubber tree fertilization is bound to have some bias. In addition, with the tapping to stimulate technology development, rubber tree nutrition law also will be changed. Therefore, re-examine the rubber tree nutrition diagnosis time is of great significance.In this paper, field experiment examined the year in October, November, December, April and July the following year, a number of different sampling time of leaf nutrient differences in Hevea brasilensis, as well as changes of different varieties and nutrition in order to be able to choose a more appropriate sampling time to carry out nutrition diagnosis. Making of fertilizer a year under the guidance of a more targeted. The results show that:1. Monthly dynamic changes of mineral nutrition of leaves in different Hevea brasilensis varieties1.1 Monthly dynamic changes of mineral nutrition of leaves Hevea brasilensisThree different varieties of rubber tree leaves the film of N, P and K content of April to December generally decreasing, while the Ca and Mg content showed a gradual increase. Three varieties of rubber tree leaves variation of the same mineral elements similar to.1.2 The differences of mineral nutrients element in the differernt tapped Hevea brasilensis varietiesThe tapped rubber trees of different varieties of mineral nutrition differences were as follows:leaf mineral elements, Reyan 7-33-97 N and P content was significantly higher than the PR107 and Reyan-879, PR107 Ca level was significantly higher than the Reyan 7-33-97 and Reyan,Reyan 8-79 Mg level was significantly higher than Reyan 7-33-97, and PR107.1.3 The tapped rubber mineral elements in leaves and changes in the yearHevea brasilensis leaves for the annual variation of mineral elements in the beginning of N, P and K content is the highest throughout the year content of Ca and N, P and K on the contrary the lowest throughout the year, with the development of the rubber leaves, nutrient gradually deplete until the end of the year when the N, P and K content of the overall downward trend, while the rapid increase in Ca content and Mg content of the change in the relatively flat year.7-9 months each year in the annual average nutrient content of the closest.. 2 Nutrition Diagnosis of sampling time 2.1 The leaf nutrient analysis of the correlationt in different sampling time,April 2009 leaf N, P and Mg content and in October 2008 showed significant positive correlation, while the K and Ca content of no significant correlation; in July 2009 Leaf N, K content and in April 2009 no significant correlation, while the P content was significantly positively related to Ca and Mg content showed highly significant positive correlation; in July 2009 Leaf N, P and Ca content and in October 2008 showed a significant positive correlation, while the Mg content was significantly positively related to K-related is not significant.2.2 leaf nutrient content regression equations significant testIn April 2009 and October 2008 the establishment of the leaf N, P and Mg content of the linear regression equation, as well as in July 2009 and April 2009 the establishment of the leafP, Ca and Mg equation is of great significance. One in April 2009 and October 2008 the establishment of leaf N and P content of the linear regression equation significantly higher than that of its July 2009 and April 2009 the establishment of leaf N and P content of the linear regression equation.Therefore, the year in October the rubber leaves of N and P content to guide the following year, in April fertilization is feasible..
|
PDF Full Text Request