EFFECT OF SPLIT N FERTILIZER APPLICATION ON PHYSIOAGRONOMIC TRAITS OF WHEAT (TRITICUM AESTIVUM L.) UNDER RAINFED CONDITIONS
Muhammad Sohail*, Imtiaz Hussain*, Riaz-ud-din*, Syed Haider Abbas*, Maqsood Qamar* and Muhammad Noman*
ABSTRACT
Low soil fertility is one of the main wheat yield limiting factors under rainfed conditions. Farmers usually apply full N dose at seeding. However, winter showers during vegetative growth period provide an opportunity to apply N in split doses. Study was conducted to find out appropriate N rate and application method to enhance wheat productivity. -1 Three N rates i.e., 60, 90, and 120 kg ha and three application methods i.e. full basal N dose at planting and N application in two and three equal split doses at tiller formation and stem elongation stages. Maximum grain yield -1 -1 (5.20 t ha ) was achieved when N was applied @120 kg ha in three equal split doses at planting, tiller formation and stem elongation stages. N application in 2 and 3 split doses resulted in 25 - 50% grain yield advantage at all N rates as compared to single basal N dose. Split N application was -2 associated with significant increase (P<0.05) in spikes m , 1000 grain weight and dry matter production. Split N application was also linked with better flag leaf chlorophyll retention and cooler crop canopies during grain filling stages which showed positive association with grain yield.
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