KUNGABOQAR YETISHTIRISHDA KALIYLI O‘G‘ITLARNING TURLI SHAKL VA ME’YORLARINNI TUPROQDAGI HARAKATCHAN FOSFOR DINAMIKASIGA TA’SIRI

The study investigated the effects of different forms and rates of potassium fertilizers on the content of available phosphorus in soil under sunflower cultivation in irrigated typical sierozem soils of the Altynsay district, Surkhandarya region. The field experiment included an N250P175 kg/ha mineral fertilizer background and K2SO4 and KCl applied at rates of 90–210 kg/ha. The results showed that K2SO4 application generally maintained higher available phosphorus levels compared with KCl. The maximum available phosphorus content was recorded during the head formation stage with K2SO4 applied at 210 kg/ha.

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