Korelasi Kadar Hara Fosfor Daun Dengan Produksi Tanaman Manggis

Abstract

. Liferdi, R. Poerwanto, A.D. Susila, K. Idris, and I.W. Mangku. 2008. Correlation Test of Leaf Phosphor Nutrient with Mangosteen Production. Leaf analysis can be used as a guide to diagnose nutritional status and as a fertilizer recommendation tool for mangosteen tree. Therefore, sampling technique of standard leaf sampled should be established acurately. Leaves age are the main important factor to estimate plant nutritional status. The best of leaf sampling was the one which has the best correlation between leaf nutrients concentration with growth and yield. Leaf nutrient concentration was investigated on the mangosteen production orchard, at Bogor, Tasikmalaya, and Purwakarta Regency. Twenty relatively uniform and representative mangosteen trees had been selected, and every month leaf sample was analyzed for P concentration. Leaves sample were taken at 2 months after flush and then periodically up to 10 moths. Observations were done for number of open flower, number of dropped flower, and number as well as weight of fruit per plant. While for fruit quality analysis was done on the TSS of the flesh and the N, P, and K content of fruit parts. The results showed that 4 and 5 months leaf age were the best to be used as a leaf sample to diagnose P status since it has the highest correlation (above 0.7) between P concentration in the leaf and mangosteen fruit production. Phosphor concentration on the leaves decreased with the age of leaves increased. Mangosteen leaves from Purwakarta contained more P than those from Tasikmalaya and Bogor. This results can be used as a guide to estimate fertilizers recommendations for mangosteen