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Both proper fertilization and integrated weed management are major components for improving potato (Solanum tuberosum L.) yield productivity. So, two field experiments were conducted during the two successive winter seasons of 2013/2014 and 2014/2015, Sakha Agricultural Research Station, Kafrelsheikh Governorate. Each experiment consisted of forty two treatments in split plot design with four replicates were used. The main plots included seven fertilizers combination between organic and mineral fertilizers with or without bio-fertilizer and the sub-plots contained six weed control treatments (Gesagard and Sencor as soil-acting herbicides each applied alone or combined with hand hoeing, hand hoeing twice and un-treaated check). The existed weed species in the two experimental potato fields were Chichorium endivia, Medicago hispida Gaertn and Chenopodium album as broad leaf weeds, Phalaris minor Retz. as annual grassy weed and Cyperus rotundus as perennial likegrass weed. The main findings indicated that all farmyard manure fertilizers application FYM at 20m/fed + (100 kg N, 30 kg P and 45 kg K /fed) plus bio-fertilizer combination gave the highest potato tuber yield (ton/fed) with increasing NPK uptake/ fed by 23.8, 34.0 and 26.1 % as compared with standard NPK at 200 kg N, 60 kg P and 90 kg K/fed treatment, respectively. Both Gesagard at 0.75 L/fed and Sencor at 0.2 kg/fed each plus hand hoeing once and hand hoeing twice gave the highest controlling percentage on weeds density by 90.48, 94.12 and 90.19%, and dry weight by 93.63, 90.37 and 88.09 %, respectively, at 70 days assessment, and the same trend was observed at 95 assessment increasing N, P and K % and their uptake (kg/fed) in potato tubers than un-weeded check. The effects of interaction between fertilizer and weed control treatments show that number of tubers /plant, tubers yield grade A%, tubers yield (g/plant) and tubers yield (ton/fed) were increased significantly by adding 20 m farmyard manure and 100 kg N, 30 kg P and 45 kg K/fed with bio-fertilizer and (Sencor at 0.2 kg /fed or Gesagard at 0.75 kg/fed ) plus hand hoeing packages. There were no residues of herbicides (Gesagard at 1.0 L/fed and Sencor at 0.3 kg/fed) were detected in potato tubers at harvest. Thus, it can be concluded from this study that combination of 20 m farmyard manure plus NPK [100 kg N, 30 kg P and 45 kg K/fed] + bio-fertilizer with spraying (Gesagard at 0.75 L/fed or Sencor at 0.2 kg/fed) followed by one hand hoeing, which recorded highest reduction on density weeds accompanied with increasing of NPK uptake and potato tubers yield (ton/fed), without any effect in potato tubers at harvest..

journal of plant production

Effect of Organic, Bio and Mineral Fertilization with Weed Control on Weed Species, Herbicides Residues, NPK Uptake by Potato Tubers and Crop Productivity.