Kanwar, R.S.Yadav, Saroj2018-10-182018-10-182018http://krishikosh.egranth.ac.in/handle/1/5810081728Investigations were carried out on absorption and translocation of nutrients in wheat infected with Heterodera avenae, its management through organic amendments, crop rotation and additional fertilizers as soil application and spray. Effect of fertilizers on emergence of larvae from cyst was also studied. Absorption and translocation of nutrients in wheat was hampered by nematode. Combination of all four nutrients promoted plant growth and reduced nematode population. N, P, K and Zn contents in soil were more, in their respective treatments, where the individual nutrients were applied. Amount of nutrients was more in infested soil than uninfested soil. Combination of all the four nutrients increased the nutrient uptake in wheat and nutrient content in straw and grain was more in uninfested soil. Organic amendments reduced nematode populations and increased plant growth both with and without nematicide. Castor cake at 20g/kg soil increased plant growth but neem cake at same dose gave maximum population reduction. All the organic amendments performed better in combination with nematicide than alone. Recommended doses of fertilizers with urea (2.5 %) + zinc (0.5 %) spray at 30 days after sowing followed by kinetin (100 ppm) spray at 40 days after sowing improved maximum plant growth but 30 % higher dose of fertilizers reduced maximum nematode population. Fenugreekwheat rotation increased plant growth more than other rotations but mustard-wheat and cabbage-wheat rotations reduced maximum nematode population. Fenugreek and gram increased N content in soil but maize reduced the N and P content and cabbage reduced the K content in soil. Nematode penetration occurred in susceptible wheat, resistant wheat and maize but not in gram, fenugreek, mustard, cabbage, garlic and onion. Under laboratory conditions, all fertilizers suppressed larval emergence from cysts, except zinc, which stimulated it. In pots, minimum nematodes in soil and roots were found at higher dose of urea. In zinc larvae in roots and soil were less than untreated check (water) but higher than other fertilizer treatments.ennullThesis