[The combined use of mineral fertilizers and herbicides in potatoes]
1985
Daou, M. | Masri, T. | Saghir, A.R. | Abdel-Malak, T. (National Council for Scientific Research, Beirut (Lebanon))
In 1984 metribuzin, metazachlor and trifluralin were tested on potato at rates of 1.5 and 0.75kg/ha (a.i.) respectively. The following fertilizer combination: N 200kg/ha, N + P200+100kg/ha, N + K 200+100kg/ha and NP + K200+100+100kg/ha+ were applied separately to plots treated separately with the three herbicides. Results from the experiment showed that the different combinations of fertilizer mixtures and herbicides mentioned above had different effects on Chenopodium album, Amaranthus retroflexus, Avena sp, Oxalis cernua and Convolvulus arvensis. In general metribuzin was the most effective on annual weeds and on Oxalis while metazachlor showed little efficacy on most annual weeds during the first 35 days before planting. The potato plants showed phytotoxic symptoms when treated with metazachlor, and a decrease in tuber yield was recorded. Trifluralin also had a decreasing effect on the yield, while the yield of plots treated with metribuzin was similar to that of the handweeded plots and exceeded that of the control plots (not handweeded). There was no effect of the different herbicides used-after the fertilizer application-on the quality of the potato tubers, and the fertilizer mixtures used had no effect on yield and quality of the tubers due to the high levels on N, P and K in the soil before fertilizer application (180; 3.8; and 29.3 mg/100g of soil respectively). While the leaf tissue analysis showed a mean N, P, K level of 6.6%, 0.53% and 5.4% of dry matter respectively
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