Nutrient indexing in Khasi mandarin grown on Indian Alfisols

Extensive surveys were carried out covering a many as ۴۰ orchards of Khasi mandarin in Nungba sub-division under Tamenglong district of Manipur, India. DRIS-based analysis predicted the optimum values of available nutrients in soil as: N ۱۴۲.۴-۲۲۲.۳ %, P ۵.۹-۸.۲%, K ۱۱۰.۵-۲۷۰.۳%, Ca ۱۵۲.۴-۲۸۱.۳%, Mg ۲۸.۳-۷۹.۴%, Fe ۳۲.۴-۴۹.۲ppm, Mn ۲۶.۶-۴۱.۱ppm, Cu ۰.۸۹-۱.۴ppm, Zn ۱.۲-۲.۴ ppm in relation to fruit yield of ۲۸.۲-۴۹.۶ kg/tree. While DRIS indices developed revealed an optimum value of different nutrients as: ۱.۸۶-۲.۶۲%N, ۰.۰۸-۰.۱۰%P, ۰.۸۹-۱.۸۶%K, ۱.۶۲-۲.۱۲% Ca, ۰.۴۰-۰.۵۰% Mg, ۱۱۹.۴-۲۱۹.۴ ppm Fe, ۵۸.۷-۸۴.۷ ppm Mn, ۲.۲-۳.۳ ppm Cu, and ۲۰.۸-۲۹.۸ ppm Zn in relation to fruit yield of ۲۸.۲-۴۹.۶ kg/tree. Nutrient constraints in the form of N, P, Ca, Mg, Cu, and Zn were identified using these diagnostics which must find a due place in a fertilizer program of mandarin orchards of the region to obtain sustainable optimum fruit yield. Various nutrients in the order of decreasing influence on yield were rated as: : Zn < P < Ca < Mg < N < K < Fe < Mn < Cu through leaf analysis. While through soil analysis, DRIS indices showed different nutrients influencing the fruit yield as: Ca < Mg < P < Zn < N < K < Cu < Mn < Fe.Extensive surveys were carried out covering a many as ۴۰ orchards of Khasi mandarin in Nungba sub-division under Tamenglong district of Manipur, India. DRIS-based analysis predicted the optimum values of available nutrients in soil as: N ۱۴۲.۴-۲۲۲.۳ %, P ۵.۹-۸.۲%, K ۱۱۰.۵-۲۷۰.۳%, Ca ۱۵۲.۴-۲۸۱.۳%, Mg ۲۸.۳-۷۹.۴%, Fe ۳۲.۴-۴۹.۲ppm, Mn ۲۶.۶-۴۱.۱ppm, Cu ۰.۸۹-۱.۴ppm, Zn ۱.۲-۲.۴ ppm in relation to fruit yield of ۲۸.۲-۴۹.۶ kg/tree. While DRIS indices developed revealed an optimum value of different nutrients as: ۱.۸۶-۲.۶۲%N, ۰.۰۸-۰.۱۰%P, ۰.۸۹-۱.۸۶%K, ۱.۶۲-۲.۱۲% Ca, ۰.۴۰-۰.۵۰% Mg, ۱۱۹.۴-۲۱۹.۴ ppm Fe, ۵۸.۷-۸۴.۷ ppm Mn, ۲.۲-۳.۳ ppm Cu, and ۲۰.۸-۲۹.۸ ppm Zn in relation to fruit yield of ۲۸.۲-۴۹.۶ kg/tree. Nutrient constraints in the form of N, P, Ca, Mg, Cu, and Zn were identified using these diagnostics which must find a due place in a fertilizer program of mandarin orchards of the region to obtain sustainable optimum fruit yield. Various nutrients in the order of decreasing influence on yield were rated as: : Zn < P < Ca < Mg < N < K < Fe < Mn < Cu through leaf analysis. While through soil analysis, DRIS indices showed different nutrients influencing the fruit yield as: Ca < Mg < P < Zn < N < K < Cu < Mn < Fe.

کلیدواژه ها:

Khasi mandarin ، nutrient diagnostic ، leaf analysis ، soil analysis ، optimum yield