The Critical Period of Weed Control in Potato
2006
Barjasteh, A`li Reza | Chavushi, Hasan
A study was conducted in during 1380-1381 in Semnan agricultural research center to determine the critical weed control period in Potato. Treatments were replicated four times in randomized complete block design. Treatments included weed free and weed infested periods up to 10, 20, 30, 40 days after potato emergence and whole growth season (weed free and weedy check). Results showed that critical weed control period in Potato was nearly similar across years, for example, between 15-24 days after Potato emergence (in first year) and 15-28 days after Potato emergence (in second year) with 3.5% allowance reduction for yield. By increasing allowance reduction for yield to 5%, the critical period was changed to a critical weed control time in 1380 (19 days after emergence) and in 1381 with 5% allowance reduction for yield, critical weed control period was between 19-22 days after Potato emergence. Weed dry matter and population decreased with increasing weed free period. Main stem diameter of potato decreased when weed infested period increased. Weedy check had the least main stem diameter. Weed infest period caused the number of lateral branches decrease significantly (at the level of %5), but weed free period didn&rsquot have any effects on it, also weed interference caused the main stem height of weed infested treatments be lower than weed free treatments.
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