Revalidation of soil test based fertilizer dose for chilli crop and their influence on soil nutrients.



Department of Soil Science and Agriculture Chemistry, College of Agriculture, UAS, Dharwad-580 005, India


A field experiment was conducted during kharif 2011 at a farmer’s field in Koliwad (Hubli taluk) village in Northern transitional Zone of Karnataka between 15° 21′ N latitude and 75° 24′ E longitudes and at an altitude of 629 m above mean sea level (MSL). In the soil test crop response (STCR) NPK dose (216:116:166, N: P2O5: K2O kg ha-1, respectively) gave higher chilli dry fruit yield. The RDF (100:50:50 kg N: P2O5: K2O kg ha-1) recorded dry fruit yield of 763 kg ha-1 and it increased to 1257 kg ha-1 under STCR dose indicating an increase of 39 per cent. The highest ascorbic acid content of 151.3 mg 100 g-1 was recorded in the STCR dose of NPK and it was on par with soil test based N and K dose modified by ± 50 per cent and P dose modified by ± 25 (149.5 mg 100 g-1). Soil phosphatase activity (14.12 µg g-1 soil h-1) was significantly higher in phosphate solubilizing bacteria (PSB) treated plot which also received N and K dose as per state soil testing laboratory recommendation + 75 per cent of RDP under medium level of P test values as compared to untreated plots.

KEY WORDS:  Ascorbic cid content, Chilli, Organic carbon, Soil fertility, Soil phosphatase activity,

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