Impact of A Nano-N-P-K Fertilizer With/Without The Compost on Some Soil Chemical Characteristics and Cowpea Yield under Salinity Conditions

Two field experiments have been carried out during two summer season (2022 and 2023) aims for studying the combined effect of a nano-N-P-K fertilizer with as well as without the compost in presence of the mineral N-P-K fertilization on some properties of the cowpea (Vignaunguiculata L. Walp) crop production under saline soil conditions. The experiment was set at Sahl El-Hessiana Agricultural Research Station (El-Sharkia Governorate-Egypt) in a 3-replicates split-plot scheme. It has been found that fertilization by the compost with the prepared nano-N-P-K fertilizer with or without the N-P-K-mineral fertilization improves a number of soil chemical characteristics such as decreasing pH and salinity, and increasing available N, P and K contents in soil. Weight of pods/plant (g), seeds/plant (g), 100-seeds (g), and yield (ton fed-1, (fed=0.42 ha)) of pods and seed were increased by compost and nano-N-P-K fertilizations. It can be concluded from this study that compost and nano-fertilizers in a combination addition with the N-P-K mineral fertilization has improved soil nutrients' status and the estimated yield component and production of cowpea crop in saline soil conditions.