EFFECT OF SPLIT APPLICATION OF N, K AND FYM LEVELS ON THE PRODUCTIVITY OF SEED POTATO DERIVED FROM TRUE POTATO SEED

Abstract

ABSTRACT A field experiment was carried out during the period from November, 2016 to April, 2017 at the farm of Sher-e-Bangla Agricultural University, Dhaka, to investigate the effect of split application of N, K and FYM levels on the productivity of seed potato derived from true potato seed (TPS). Three Nitrogen (N) levels viz., N 1 = 60 kg N ha -1 at planting + 60 kg N ha at first earthing up, N 2 = 60 kg N ha -1 at planting + 30 kg N ha -1 at first earthing up + 30 kg N ha -1 at second earthing up and N 3 = 60 kg N ha -1 at planting + 20 kg N ha -1 at first earthing up + 20 kg N ha -1 at second earthing up + 20 kg N ha at 60 DAP, two Potassium (K) levels viz., K 1 = 60 kg K ha -1 -1 at planting and K = 30 kg K ha -1 at planting + 30 K ha -1 at first earthing up and two Farm Yard Manure (FYM) levels viz., F 1 1 = 6 t FYM ha -1 at planting and F 2 -1 = 10 t FYM ha at planting were considered for the experiment. The experiment was laid out in a split split plot design with three replications. The collected data on different growth and yield parameters were analyzed statistically. Results revealed that all the treatment combinations showed promising effect on yield and yield attributes of potato. It was observed that the highest weight of tuber hill -1 (0.284 kg), tuber yield (37.87 t ha -1 ) and „A‟ graded seed potato yield (10.60 t ha -1 ) was found from N 1 K 2 F but the highest non-seed potato yield (22.47 t ha -1 ) was found from N 3 K 1 F 1 2 . But the highest percent of seed potato yield by weight (70.66%), „B‟ graded seed potato yield (8.98 t ha ) and percent of non-seed potato yield by weight (65.00%) were found from N where the lowest number of stem hill -1 (2.00), weight of tuber hill -1 (0.173 kg), tuber yield (23.00 t ha -1 ), seed potato yield (9.93 t ha -1 ), „A‟ graded seed potato yield (5.78 t ha -1 ) and „B‟ graded seed potato yield (4.15 t ha -1 ) were also achieved from N 3 K 2 F 2 . -1 2 K 1 F 1 2 -