Effect of Water-Saving Irrigations on Occurrence of Weed and Yield of Rice in Rice Paddy Fields
2007
Kwon, O.D. (Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea) | Kuk, Y.I. (Chonnam National University, Gwangju, Republic of Korea), E-mail: [email protected]
This study was carried out to find the best irrigation method on saving of agricultural water throughout a study on occurrence of weed, controlling efficacy on weeds, and yield of rice by using different irrigation methods in rice paddy fields, Leaf age at 15 days after transplanting was not different among irrigation methods, but the progressing of leaf age was quicker in a perennial weed, arrowhead and an annual weed, Monochoria vaginailis than in other weeds. The numbers of weed occurrence and the dry weight of weeds at 15 days after transplanting were 177 to 227g m-² and 5.64 to 6.80g m-² by different irrigation methods, respectively. The dry weight of weeds at 50 days after transplanting and 10 days after heading was lower in D.I. and was higher in SW2 than in ST.I with or without an herbicide application. However, controlling efficacy on weeds was over 91% regardless of irrigation methods. Rice yield in D.I. of with or without an herbicide application, was reduced by 8% and 4%, respectively, compared to ST.I. And rice yield in SW2 was reduced by 2% and 10%, respectively compared to ST.I. The yield of rice in other irrigation methods such as SW1 and SW3 was similar with that of ST.I. The weed occurrence, controlling efficacy, and rice yield were similar between SW1 and ST.I. Thus, SW1 is the best irrigation method in rice culture because of saving water.
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