Availability and uptake of nutrients as influenced by levels and schedule of application in upland rice

摘要

Field experiment was conducted at Coconut Research Station Balaramapuram during Kharif season 2017?with an objective to evaluate the effect of nutrient levels and schedule of nutrient application on the nutrient?uptake, nutrient availability and yield of upland rice. The experiment was laid out in factorial RBD with?nutrient levels as first factor and schedule of nutrient application as second factor. Among the nutrients?levels, NPK @ 120:30:60 kg ha-1 (n4) recorded the highest N and K uptake but it was statistically comparable?with n3 (90:30:45 kg ha-1). However, P and Zn uptake was the highest in n3 (NPK @ 90:30:45 kg ha-1) and?it was significantly superior to other nutrient levels. Post-harvest soil nutrient status revealed that available?N, P and K status and organic carbon content were the highest in the treatment NPK @120:30:60 kg ha-1.?Among the schedules of nutrient application, treatments with foliar application of 0.2 per cent zinc sulphate?and 0.04 per cent sodium borate at 45 days after sowing (DAS) recorded higher availability of nutrients and?uptake of nutrients by crop. Organic carbon content of soil was not significantly influenced by schedule of?nutrient application. Grain yield and net returns were significantly influenced by nutrient levels and schedule?of nutrient application. Application of N:P:K @ 90:30:45 kg ha-1 applied as N in three equal splits, P as?basal and K either in two equal splits or three equal splits along with foliar spray of 0.2 per cent zinc?sulphate and 0.04 per cent sodium borate recorded the highest grain yield (3.25 t ha-1) and net returns (35,?637 Rs ha-1) .