Effect of incorporation of crop residue on yield and nutrient uptake under greengram-sunflower sequence

The present investigation was undertaken at Central Research Station, Dr. PDKV, Akola during 2004-05 on Vertisols particularly with montomorillonitic type with 11 treatments and three replications framed under randomized block design in kharif season for greengram and split plot design in rabi season for sunflower. The results indicated that incorporation of sunflower straw @ 4 t/ha+125% N+100% P of RDF gave significantly higher grain and straw yield of greengram and sunflower. Total uptake of nitrogen, phosphorus and potassium was highest with treatment T-8 incorporation of sunflower straw @ 4 t/ha+RDF@ 125% N+100% P in greengram. Total uptake of micronutrient (Zn, Fe, Cu, Mn, B and Mo) included sulphur maximum with treatment T-8 incorporation of sunflower straw @ 4 t/ha+RDF @ 125% N+100% P in greengram. Treatment T-8 incorporation of sunflower straw @ 4 t/ha+RDF @ 125% N+100% P with 100% RDF of sunflower was significantly superior over 75% RDF in relation to total uptake of micronutrient including sulphur in rabi seasons of sunflower. In view of the above, it can be stated that incorporation of sunflower straw @ 4 t/ha+125% N+100% P of RDF to greengram in kharif season and 75% RDF to sunflower in rabi season indicated thereby 25% saving of fertilizers and enhanced yield and total nutrient uptake of greengram and sunflower.