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ThesisItem Open Access Serogroups of rhizobium trifolii isolates from nodules of egyptian clover (Trifolium alexandrium) grown in different Agro-Climatic regions of the punjab(Punjab Agricultural University, Ludhiana, 1973) Bikkar Singh, Sidhu; S. S, BrarThesisItem Open Access Effect of Mulches on the distribution of salts and moisture in soils(Punjab Agricultural University, Ludhiana, 1973) Sadhu Singh, Sandhu; Nirmal Tej, SinghThesisItem 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