A field experiment was conducted to study the effect of different levels of customized fertilizer (CF) on soil nutrient availability, yield and economics of onion. The results revealed that the significantly highest plant height (57.77cm), stem diameter (6.03cm) and bulb diameter (15.13cm) at the time of harvest, fertilizer use efficiency,bulb yield (22.34 t ha -1 ) and benefit:cost ratio (2.56) of onion were recorded in 100 % recommended dose of NPK through CF in three equal split doses . The significantly highest available nitrogen (213 kg ha ) either two or three splits through CF to onion appears to be improving soil fertility, yield and yield contributing character of onion and getting higher net monetary returns.

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A field experiment was conducted at soil test crop response (STCR) correlation project farm of Mahatma Phule Krishi Vidyapeeth, Rahuri Maharashtra.The result showed that individual application of nitrogen (N), phosphorus(P),potassium(K) or organic nutrient sources (Farm yard manure) recorded less value of preseasonal sugarcane ratoon but the integration of both the sources showed significantly improved all the growth, yield and quality parameters of preseasonal sugarcane ratoon. The maximum number of internodes were ranged between 21-30 with mean of 25.42, number of leaves 6-10 with mean of 7.21, length of internodes 12.50-16.80 cm with mean of 14.41 cm, girth of internodes 11.30-13.10 cm with mean of 12.15 cm and height of millable cane 335-385 with mean of 351.75 cm, respectively were found higher with application of residual effect of 30 t ha -1 farm yard manure (FYM). However, the quality traits viz., brix ranged from 18. were enhanced considerably with residual 15 and 30 t FYM ha -1 blocks over without FYM. The application of organic and inorganic fertilizers will not only enhance the growth, yield and quality of preseasonal sugarcane ratoon but also conserve agro-ecosystem for sustainable crop production.

The field experiment on effect of fertilizer levels on nutrient availability and yield of cotton on Vertisol was conducted at Mahatma Phule Krishi Vidyapeeth, Rahuri during May to September, 2008. The experiment was laid out in factorial randomized block design with three replications and two main treatments i.e. hybrid Bt RCH-2 and Non-Bt RCH-2 and nine sub treatments with different fertilizer doses i.e. F 1 -No recommended doses of fertilizer (RDF), F 2 -50 % RDF, F 3 -75 % RDF, F 4 -100 % RDF, F 5 -125 % RDF, F 6 -150 % RDF, F 7 -100 % RDF + 2% DAP spray, F 8 -100 % RDF + 1 % MgSO 4 and F 9 -100 % RDF + 1% KNO 3 . The results revealed that the non-Bt hybrid recorded maximum nitrogen (435.67 kg ha ).