Effects of long-term application of three major nutrients on the citrus trees growing in the orchard converted from a paddy field, 2: On the soil potasium content and forms of the NPK fertilizers application, non-K and non-fertilier application
1998
Iwakiri, T. (Saga-ken. Fruit Tree Experiment Station, Ogi (Japan)) | Matsuse, M. | Sindou, T. | Yamaguchi, M.
This experimental field changed paddy field in orchard, and it made three major nutrients. NPK elements, fertilizer response test which extended for, long term. Contents of this report analyzed it about a forms and a content of potassium in the soil of NPK-fertilizers application plot, non-K plot, non-fertilizers application plot in an eye after, examination start for 18 years and 23 years and made correlation with the potassium density from between method of fertilizers application and a leaves of citrus trees. There was the most water-soluble potassium, exchangeable potassium, available potassium in the soil with three major nutrients. NPK plot, and there was a most little non-K plot. As for the ratio of slightly soluble potassium in available potassium, there was the most, non-K plot. There was significant difference of 5 % or more correlation with water-soluble potassium, any sample collection of depth as a result of having examined soil sample and correlation with potassium content in the soil during a leaves of citrus trees. The coefficient of correlation to be the highest fitted exchangeable potassium content of the soil of, 0-10 cm between things of potassium density during a leaves of satsuma mandarin with r=0.906 (1 % significant difference). 0.5 cmol(+)kg-1 is necessary for the bottom value of exchangeable potassium of soil diagnosis of, citrus trees when calculates from primary regressive equation of this neither
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