The present studies were conducted to obtain basic data for reasonable fertilization and management of satsuma mandarin orchards in Cheju Island. Leaf and soil sampling was done for 200 orchards and the correlations among yield, rate of fertilization, leaf and soil mineral contents were analyzed.
1. Chemical properties of Cheju orchard soils were characterized as: pH 5.7, 8.86% of organic matter content, 232.9 ppm of available P, and respective contents of exchangeable K, Ca, Mg, and Na of 1.37, 6.73, 2.26, and 0.20 me. All components except organic matter were a little higher in Buk Cheju-Gun (Northern Cheju County) area.
2. High yielding orchards contained a little higher amounts of soil minerals except P which was more abundant in low yielding orchard soils.
3. Leaf contents of N, P, K, Ca, and Mg were respectively 2.97, 0.153, 1.48, 3.57, and 0.341, and most of these elements were in adequate range.
4. Mineral content of leaves in Seogwipo region and other high yielding orchards was a little higher than the average. It was also note that N and P were higher in early satsuma orchards, while Ca and Mg were higher in common satsuma orchards.
5. Leaf contents of N, Ca, Mg and soil organic matter showed highly positive correlation with yield, respectively.
6. Soil P content showed either a slightly negative relation with soil organic matter or highly positive correlation with exchangeable bases, while there was a negative relation between N and P content of leaves.
|