Root Growth and Soil Water Dynamics in Relation to Inorganic and Organic Fertilization in Maize-Wheat

Agricultural productivity is increasingly becoming dependent upon soil fertility, which is generally thought to be supplemented through the application of nutrients mainly through inorganic fertilizers. The present study aims to characterize the soil physical environment in relation to long-term application of farmyard manure (FYM) and inorganic fertilizers in a maize-wheat cropping system. The treatments in both the maize and wheat systems included a control (without any fertilizer or FYM), FYM (farmyard manure at 20 t ha-1), N100 (nitrogen at 100 kg ha-1), N100P50 (nitrogen and phosphorus at 100 and 50 kg ha-1), and N100P50K50 (nitrogen, phosphorus, and potash at 100, 50, and 50 kg ha-1). The treatments were replicated four times in a randomized complete block design in sandy loam soil. The root mass density in surface layers of both the crops was lower in FYM and higher in inorganic fertilizer plots. The root length density was found to be highest in FYM-treated plots and lowest in control plots. The periodic soil matric suction during wheat following maize remained highest in FYM plots followed by that in N100 plots in all the layers. The soil water storage of wheat at harvest (rice-wheat) was highest (21.1 cm) in control and lowest (17.8 cm) in FYM-treated plots. The soil water status, root growth, and crop performance improved with balanced fertilization.