PJB-2024-626
INTEGRATED USE OF ORGANIC AND INORGANIC SOURCES OF PHOSPHORUS NUTRITION FOR TOMATO GROWTH AND NUTRIENT UPTAKE
RASHID MUKHTAR
Abstract
A major portion (75 to 85%) of applied phosphatic fertilizers in the soils of Pakistan is due to poor soil health and imbalanced use of N, P, and K fertilizers, which is a significant hurdle for minimizing the gap between tomato cultivars' potential and actual yield. However, by integrating chemical P sources with organic P sources, this yield gap can be reduced. The impact of P from different combinations of organic and inorganic sources was evaluated for two years under controlled greenhouse conditions on fertilizer use efficiency, growth, yield, and quality parameters of tomatoes. The results showed enhancements in yield attributes (15-45%) and fruit yield (8-16%), as well as improvements in N, P, and K uptake (10 to 50%) and use efficiency (up to 80%), respectively, compared to using synthetic NPK fertilizers alone. Among the various combinations tested, it is recommended to apply at least 25% of P from organic manure. However, supplying up to 75% of P from organic manures has shown the highest impact on yield and fertilizer use efficiency (FUE) attributes. Utilizing VAC and KOWC can help reduce reliance on chemical fertilizers, but additional research is needed in this area.
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