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ThesisItem Open Access Fertilizer-Aeration interaction in maize under temporary flooding(Punjab Agricultural University, Ludhiana, 1972) Khera, Krishan Lal; Singh, Niramal TejThesisItem Restricted Effect of Phosphorus potassium and farm yard manure on the availiability of zinc in A long term field crop rotatin experiment(Punjab Agricultural University, Ludhiana, 1972) Sharma, Kanwal Nath; Meelu, O. P