Impact of different organic fertilizers on soil available nutrient contents, potato yield, tuber nitrate contents

Abstract

In this study, field experiment was conducted to assess the effect of different organic fertilizer and mineral fertilizer on mineral and different organic fertilizer treatments effect on available N, P, K contents, the yield of potato (Solanum tubevosum L.), cultivar Astana, nitrate contents of tuber under dark chestnut soil conditions in southeast of Kazakhstan during the spring and summer of 2022. The experiment was carried out in the field and laid out as complete randomized block design with four replicates. Thirteen treatments that are, control without fertilizer treatment, mineral fertilizer with recommended dose (N150P90K120) and eleven different organic fertilizers treatment were used. The results showed that available nutrient (N, P and K) contents of the post-harvest soil were affected by mineral and different organic fertilizers compared to the control. And, the available N, P and K contents in the soils taken from the biohumus (10 t ha-1) and cattle manure (40 t ha-1) treated plots were found to be higher than all of the other treatments and control. Similarly, plots treated recommended mineral fertilizer and different organic fertilizers had a significantly higher yield of potato tuber compared with control. When all applications were compared with each other, it was determined that the treatments that increased the potato yield the highest was the treatment of Biohumus (10 t ha-1) + BioZZ (5 L ha-1, 3 times). The highest nitrate content of tubers was obtained in mineral fertilizer with recommended dose (N150P90K120). Hence, these results suggest that organic production of potato (Biohumus, 10 t ha-1 + BioZZ 5 L ha-1, 3 times) could be an alternative to conventional production in Kazakhstan without reduction in yield, and with low nitrate content of tuber and high available nutrient contents in soil.