Effects of long term application of green manure on Satsuma orange. IV.
Effect on mineral composition of leaves
1962 Volume 31 Issue 4 Pages 351-359
Details
1962 Volume 31 Issue 4 Pages 351-359
A long term experiment on the effect of application of green manure on Satsuma orange has been set up, and the results of the effects of treatments on yield, tree growth, and soil properties were previously reported. This report deals with the results of their effects on the mineral composition of leaves.
1. Analytical results of leaves sampled by the ordinary method from 1951 to 57 revealed that there were no differences in nitrogen, phosphorus, and potassium contents of leaves among 100%, 50% and 0% green manure plots. Calcium and magnesium contents were higher in leaves of the plots receiving larger amounts of green manure (100 and 75 plots).
2. Analysis of both new and old leaves was carried out in August of 1960. It was impossible to find out significant differences in nitrogen, phosphorus and potassium contents of leaves among 100%, 50% and 0% green manure plots, because of large deviations of contents of those elements even in the same plot. Calcium and magnesium contents in the leaves of 100% plot were significantly higher than those of 0% plot, and those of 50% plot were intermediate between those of 100% and 0% plots, or rather close to those of the plots receiving a larger amount of green manure.
3. Analysis of leaves sampled monthly from April to September of 1961 showed that difference was scarcely found in the contents of nitrogen, phosphorus and potassium of new leaves between 100% and 0% green manure plots. In old leaves, there were slight differences in phosphorus and potassium contents from April to July, but these differences disappeared in August or September.
4. It was impossible to find any correlation among yield, tree growth, quality of fruit juice and N, P or K content of leaves, while there were significant correlalions between citric acid content of fruit juice and calcium content of leaves, and also between exchangeable calcium content of soil and calcium content of leaves.
