EFFECT OF SOME WEED CONTROL TREATMENTS ON TRANSPLANTED RICE AND NUTRIENTS UPTAKE BY RICE AND WEEDS. | ||||
| Journal of Plant Production | ||||
| Article 3, Volume 28, Issue 1, January 2003, Page 23-35 PDF (3.16 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.241854 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| E. R. EL-Desoki | ||||
| Botany Department, National Research Centre ,Dokki , Cairo ,Egypt. | ||||
| Abstract | ||||
| Two field experiments were conducted during the two summer seasons of 2000 and 2001 at Sharbas Village , Domietta Governorate, Egypt, to study the effect of some weed control treatments in transplanted rice and nutrients uptake by rice and weeds. The predominant weeds in the experimental field were Echinochloa crus-gal/i and Cyperus difformis .The results indicated that when the weeds were allowed to grow with the crop ,grain yields were reduced by about 62.03 % when compared with twice hand weeded treatments after 20 and 40 days from transplanting .The heighest dry weight of weeds (210.34 g/m2) were observed in the unweeded check. The following treatments were applied: Cinmethylin (Argold) 0.03 kg a.i.lfed, Oxadiazon (Ronstar) 0.19 kg a.i/fed, Thiobencarb (Satrin)1.00 kg a.i Ifed, Butachlor (Machete) 0.90 kg a.i Ifed, and Bentazon (Basagrane) 0.72 kg a.i Ifed alone or plus one hand weeding after 40 days from transplanting, hand weeded treatments twice after 20 and 40 days from transplanting as well as unweeded control . All herbicides were applied 3 days after transplanting rice, except Bentazon which was applied 15 days after transplanting .Hand weeded treatment twice as well as all herbicide treatments plus one hand weeded treatment gave the best weed control and increased grain yield I fed when compared to herbicid treatments alone . Bentazon alone gave poor control for Echinochloa crus - gal/i . All weed control treatments reduced N,P and K uptake by weeds from (12.67 to 0.210 kg N from 0.468 to 0.01 kg P from 7.74 to 0.17 kg k) when compared to the unweeded control (31.8 kg N, 1.175 kg P and 19.44 kg K )/fed. The greatest uptak of N,P and K by rice was obtained by all herbicide treatments plus one hand weeded treatment after 40 days from transplanting and by twice hand weeded treatments . From the obtained results it can be concluded that all weed control treatments increased rice grain and straw yields and decreased dry weight of weeds. All weed control treatments reduced N, P and K uptake by weeds. The greatest uptake of N , P and k by rice was obtained by all herbicides plus one hand weeded treatment after 40 days from transplanting. | ||||
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