Soil property dynamics under submerged paddy as affected by organic and inorganic nutrient sources

Abstract

The present investigation entitled “Effect of different Nutrient sources on soil properties under submerged rice” was conducted at at the experimental farm of department of Soil Science and Agricultural Chemistry, Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, during the Kharif season 2021-22. The field experiment was laid out in Factorial Randomized Block Design. The four levels of inorganic fertilizers application viz. N0-Absolute Control, N1- Recommended dose (100:50:50 N:P2O5:K2O kg ha-1) through chemical fertilizer (Urea, SSP, MOP), N2- Recommended dose through Konkan Annapurna Briquette (KAB) and N3-Glyricidia @ 10 tonnes per hectare which were replicated three time to study the effect of different nutrient source on chemical properties and nutrient availability in soil. The initial experimental soil was strongly acidic in reaction and showed low electrical conductivity. The soil found very high in organic carbon whereas, available N was medium. The soil was medium in available P2O5, high in available K2O. The highest available nitrogen was recorded where 34:14:6 N:P2O5:K2O kg ha-1 through Konkan Annapurna Briquette was applied. It was revealed from data that at Harvest, the maximum phosphorus (22.38 kg/ha) of soil was found in the treatment N1 i.e. application of Recommended dose of fertilizer 100:50:50 N:P2O5:K2O kg ha-1 found highest yield over rest of treatments. Among different nutrient source, It was observed that the application of recommended dose of fertilizer found significantly recorded the highest available potassium content (30 DAT and at Harvest). Based on the experimental findings, it could be concluded that, the recommended dose of fertilizer through chemicals followed by Konkan Annapurna Briquette can improve nutrient availability, thereby improving yield of the paddy under submerged condition in lateritic soil of Konkan region.