Continuous application of chemical fertilizers and organics influenced the soil chemical properties and zinc content of rice in the vertisols of the Chhattisgarh Plain

Abstract

An experiment was carried out in rice crop on Vertisol (locally called as Kanhar) at research farm of College of Agriculture, IGKV, Raipur, during kharif 2019-20 entitled “Continuous application of chemical fertilizers and organics influenced the soil chemical properties and zinc content of rice in the vertisols of the Chhattisgarh Plain”. This study comprised of ten treatments: control (no fertilizer), 50% NPK (suboptimal dose), 100% NPK (optimal dose), 150% NPK (super optimal dose) and 100% NPK along with ZnSO4 @ 10 kg/ha, 100% NP, 100% N alone, 100% NPK along with farmyard manure @ 5t/ha, 50% NPK along with blue green algae @ 10 kg/ha and 50% NPK along with green manure @ 40 kg/ha. The experiment was laid out at randomized complete block design which was replicated four times. Long term effect of continuous application of chemical fertilizers and organic manures significantly influenced the physico-chemical properties viz. highest “organic carbon (0.67%) available N (252 kg/ha), P (29 kg/ha) and K (425 kg/ha) in 100% NPK + FYM and lowest was obtained under control treatment (0.45% OC), (177 N kg/ha), (10.1 P kg/ha) and (368 K kg/ha), respectively. The addition of farm yard manure and NPK also reduces soil acidity compared to NPK use alone. Among the treatment of 150% NPK accumulated more total soluble salts end of this treatment could be attributed to low residue will effect of fertilizers and nutrient removal by crop.

Keywords

• Chemical fertilizers
• Long Term
• Organic Manures
• Vertisol