Relationship of inorganic potassium fractions to yield of cauliflower (Brassica oleracea var. Botrytis) and soil properties of light textured soils of Rangareddy district

Exploring the relationship among inorganic potassium fractions, yield and soil properties were important to know the best extractant for available K for cauliflower in the light textured soils of Rangareddy district. Surface soils in bulk were collected from thirty locations of Rangareddy district and pot culture experiment was carried out. Inorganic K fractions were analysed to evaluate the relative efficiency of extractants in determining the available K. Here, we have investigated the relationships among the soil properties, between soil properties and K uptake, between soil properties and yield, between K fractions and K uptake, between K fractions and yield. Organic carbon (r = 0.65^*,*), available nitrogen (r = 0.60^*,*) exhibited a significant positive correlation with NH₄OAc (1N) extractable K. Available potassium extracted by NH₄OAc showed a significant positive correlation with NaBPh₄ (0.2 M) extractable K (r = 0.93^*,*), 1M HNO₃ (r = 0.55^*,*) and also with citric acid extractable K (r = 0.67^*,*). Among all the extractants 1N NH₄OAc extractable K showed higher positive correlation with curd yield (r = 0.975^*,*). It had a significant positive correlation with NaBPh₄ (0.2 M) extractable K(r = 0.926^*,*).