EFFECT OF POTASSIUM HUMATE FERTILIZERS ON SOIL NUTRIENTSAND PRODUCTIVITY OF RICE CROP IN VERTISOLS OF SOUTHERNINDIAY.S. Satish Kumar, S. Balaji Nayak, C.V.C.M. Reddy, K. Arun Kumar,K. Mohan Vishnuvardhan, Jyotsna Kiranmayi and E.S.V. Narayana RaoAbstract Humic acid is an eco-friendly product needed in lesser quantity when compared to other chemical fertilizersand manures.A field experiment was conducted for three Kharif seasons(2019, 2020 and 2021)at RegionalAgricultural Research Station, Nandyala, Andhra Pradesh to study the effect of potassiumhumate fertilizerson soil quality and productivity of Rice crop in scarce rainfall zone of Andhra Pradesh,India.Applicationsof potassium humate with different doses of fertilizers showed a significant effect on selected soilcharacteristics. The levels of available N, P, K, and micronutrients likeFe, Zn, Cu and Mn insoil increasedwith different humic treatments. Significantly highest plant height, productive tillers per hill,panicle lengthand number of grains per panicle was observed with treatment (T4) 100% RDF + Soilapplication of humicacid @ 30 kg ha-1at tillering, panicle initiation and at harvest stages of crop over othertreatments. Highestgrain and straw yield of 6074 & 8374kg ha-1 respectively, was recorded with treatment T4(100% RDF+30 kgha-1Humic acid as soil application) which was on par with T2 and T3 treatments. The lowestyield was recorded with T1 (Control) 2453 kg ha-1 in all three years. |