Paper Information

Journal:   AGRICULTURAL RESEARCH   2007 , Volume 7 , Number 3; Page(s) 115 To 128.
 
Paper: 

THE EFFECT OF WEED CONTROL PERIOD ON YIELD AND YIELD COMPONENTS OF POTATO (SOLANUM TUBEROSUM) IN SEED PRODUCTION AND COMMERCIAL PLANT DENSITY

 
 
Author(s):  GOLZARDI F., MONDANI F., AHMADVAND G., SEPEHRI A., JAHEDI A.
 
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Abstract: 
To determine the response of yield and yield components of potato in seed production and commercial plant density to weed free control periods, an experiment was conducted in agricultural faculty of Bu-Ali Sina University in 2006. The trial was a factorial experiment based on a randomized complete block design with three replications. The treatments including potato plant density at two levels, 5.33 (optimum plant density of commercial fields) and 6.66 (optimum plant density of seed production fields) plant m-2 and weed control period at seven levels, in which at the five levels, weeds were removed manually for 10, 20, 30, 40 and 50 days after crop emergence and then weeds allowed to grow until harvest. In addition, two control treatments (full- season weed free and full- season infested) were taken. Each plot consisted of four rows (eight meters per row) with a row spacing of 75 cm. To study dry matter accumulation trend of potato, sampling was started 10 days after crop emergence and repeated in 10 days interval, for 11 times. Yield and yield components of potato and total dry matter of weeds were determined at harvest. The results showed that from 40 days after crop emergence total dry matter of potato was affected by weed competition and about 90 days after crop emergence weed control treatments showed maximum differences. The effect of weed control on potato dry matter accumulation, tuber yield and mean tuber weight per unit area in the low plant density was more than that of high plant density. So that full- season weed controlled to a 79%, 121% and 110.4% increase in the above mentioned potato growth indices (at their maximum amount), Respectively compared with full-season weed-infested treatment, in the commercial plant density. The number of tuber at its maximum amount in complete weed free period than that of complete weed infestation period in low and high crop plant density increased 5% and 27.9%, respectively.
However, the increase in the seed production plant density was 65%, 81.7% and 65%, respectively. Weed control treatments did not show statistically significant effects on number of main stem of potato per unit area in both crop plants density.
 
Keyword(s): POTATO, WEED CONTROL, YIELD AND YIELD COMPONENTS, DENSITY
 
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