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ThesisItem Open Access SOIL, WATER AND WEED MANAGEMENT PRACTICES FOR DIRECT SEEDED LOWLAND RICE(University of Agricultural Sciences, Dharwad, 1976) RAMI REDDY, S; HUKKERI, S B"Investigations were carried out at the Indian Agricultural Research Institute, New Delhi during Kharif seasons of 1974 and 1975 with the object of obtaining comprehensive information on soil, water, and weed management practices for direct-seeded lowland rice grown on a sandy clay loam soil. The treatments comprising four methods of soil manipulations, two practices of water management and four methods of weed management were laid out in a split -plot design with soil water management practices in the main plots and weed management practices in the sub-plots and were replicated thrice. The four soil manipulation treatments were, ( 1 ) puddling once immediately before seeding, ( 2) puddling twice immediately before and 15 days earlier to seeding, (3) compaction of surface soil to a bulk density of 1.70 to 1,80 g/cm$ and (4) ordinary field preparation by ploughing. The two water management practices were, (1) continuous submergence (4-0 cm water from establishment to maturity) and (2) partial submergence (4-0 cm water only during critical stages of initial tillering and flowering and maintaining soil moisture at 0,15 bar tension at 15 cm s o i l depth during other stages). The four weed management practices were, ( 1 ) no weeding, ( 2) manual weeding (twice), (3) pre-emergence application of butachlor at 20 kg/ha. and (4) post-emergence application of propanil at 2 1/ha. The study revealed that puddling twice at 15 days interval remarkably increased the growth and yield of rice, reduced the weed infestation, increased the N, P and K uptake by crop, reduced the hydraulic conductivity of soil and increased the water use efficiency of irrigation water. Puddling once and compaction were identical in their effects and were superior to ordinary ploughing but very much Inferior to puddling twice in respect of growth and yield of crop. Puddling twice proved to be the most profitable practice. Continuous submergence increased the yield marginally (about 7 percent) over that of partial submergence, but the latter practice required 37 percent less irrigation water and hence resulted in high water use efficiency. Continuous submergence resulted in a loss while partial submergence was an economical practice. The weeds were effectively controlled by manual weeding under all the soil manipulation practices while butachlor and propanil were found e f fe c t iv e under puddling twice and compaction treatments where the weed growth Was already reduced by about 85 to 87 percent. Manual weeding resulted in maximum growth and yield of rice. Weeds in no weeding treatment decreased the yield by 30 percent as compared with manual weeding and accounted for nearly 50 percent of nutrient depletion. Water use efficiency of irrigation water was increased by about 30 percent due to manual weeding over that of no weeding. The most remunerative cultural practices for direct seeded rice under Delhi conditions were found to be puddling twice with partial submergence followed by either manual weeding or use of herbicides."ThesisItem Open Access STUDIES ON THE CULTURAL PRACTICES IN THE CULTIVATION OF MAIZE AND POTATO GROWN ON LATERITIC SOIL(University of Agricultural Sciences, Dharwad, 1965) HUKKERI, SUBHASHCHANDRA BHUPAL; PANDE, H KABSTRACT NOT AVAILABLEThesisItem Open Access STUDIES ON STRESS DAY INDEX FOR TIMING OF IRRIGATION FOR POTATO ( Solanum tuberosum L.)(University of Agricultural Sciences, Dharwad, 1974) NIVRUTTI NINU NIMBOLE; HUKKERI, S BABSTRACT NOT AVAILABLEThesisItem Open Access THE INFLUENCE OF VARYING LEVELS OF IRRIGATION, NITROGEN, PHOSPHORUS AND POTASSIUM ON THE GROWTH AND THE YIELD OF THE POTATO(University of Agricultural Sciences, Dharwad, 1961) HUKKERI, S B; SINGH, MUKHTARABSTRACT NOT AVAILABLE