Effect of prescription-based fertilizer application on soil organic carbon and potassium fractions

The present investigation is based on prescription-based fertilizer application on soil organic carbon and potassium fractions soil under maize- wheat cropping system. The field experiment was conducted on a pre-established long-term experiment laid out in randomized block design (RBD) with six treatments; each replicated three times. The Wheat variety HPW-236 has been used for the experiment. It has been observed that the increase in all the active and passive pools of soil organic carbon was recorded with continuous use of inorganic fertilizers along with FYM, compared to the un-fertilized plots. Water soluble carbohydrates and fulvic acid were major dominant fractions of active and passive soil organic carbon pools, respectively. The exchangeable K was the important fraction of potassium contributing towards available K. Different fractions of potassium were significantly and positively correlated with grain and straw yield, available K, and total K uptake by wheat.