Response of maize (Zea mays), wheat (Triticum aestivum) and gobhi satson (Brassica napus subsp. oleifera var. annua) to balanced fertilization and azotobacter inoculation in subhumid Punjab

Abstract

The technology developed for subhumid middle of October at all the locations. Punjab at the research station has no The wheat cv. HD 2329 was sown in significance unless it is accepted by the the fust week of November, using 100 kg farmers. With this objective, a large number seed rateha at 22 em-row spacing. The of on-farm research experiments were wheat seed was treated with aldrin 30 EC 8 4 conducted on the cultivators fields to test m a g seed to control termite attack. their site-specific performance as well aS Fertilizers were applied as per treatments; acceptability with the farmers at large. Three half N and full dose of other fertilizers were \ types of trials were conducted to establish applied at sowing and the remaining N with the fertilizer response (N, P, K and Zn and fust irrigation 28 days after sowing. The azotobactor inoculation) on wheat (Triticum weeds were controlled by spraying aestivum L. emend. Fiori & Paol.), maize isoproturon 75 w p @ 1.25 kgha as post- (Zea mays L.) and gobhi sarson (Brassica emergence spray (30-40 days after sowing). napus L. subsp. oleifera DC. va.. annua L.) The crop was harvested in middle of April at raised under irrigated conditions and all the locations. Likewise, gobhi sarson cv. moisture-constraint situations during GSL 1 was sown in the third week of 1989-90. These trials were conducted at 22 October at all the 22 locations, using 5 kg locations (treated as replications) in seed rateha with 45 cm-row spacing. The .. Hoshiarpur district, representing the whole thinning was done 3 weeks after- sowing to subhumid belt in relation to soil type, maintain plant spacing 10 cm. The fertilizers irrigation facilities and climatic conditions. were applied as per treatments; half N and Maize cv. Navjot was sown in the first full dose of P and K were applied at sowing week of June, using 20 kg seed rateha at 50 and the remaining half N with fust irrigation cm-row and 22 cm-plant spacings. (28 days after sowing). The crop was Fertilizers were applied as per treatments, sprayed with metasystox 25 EC @ 625 mVha one-third N and full dose of P, K, ZnSO, and in 250 litres water to control aphid attack. azotobactor were applied at sowing, the The crop was ready for harvesting in the fust - -. remaining one-thud N at knee-high and one- week of April. thud N. at pre-tasselling stage. The weeds In a study on fertilizer requirement of were controlled by spraying Atrataf 50 w p @ maize under constraint of irrigation, the 20 kgha as pre-emergence spray in 500 maize yield increased with each level of litres water. The crop was harvested in fertilizer. The highest grain yield (26.1 qha)