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The size of the nano urea slow release fertilizer ranged from 52.41 nm to 69.86 nm, and the size of the phosphate and potash fertilizer ranged from 81.85 nm to 87 nm. The weights of 1000 grains were 31.8 g, 33.28 g, 33.39 g, 36.65 g and 44.90 g in the control, neem cake, chemical fertilizer, PGPR and nano SRF, respectively. The protein concentrations were 162 mg g-1 in the control, 231 mg g-1 in the neem cake, 192 mg g-1 in the chemical fertilizer, 285 mg g-1 in the PGPR and 336 mg g-1 in the nano SRF. Nano slow release fertilizer treatment has stimulated germination and biochemical characteristics in Vigna radiata that are positively reflected in the yield attributes.

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