Land Flooding Effect Before and After Planting on Rice Yield in the System of Rice Intensification

Rice is the primary carbohydrate source for half world population, particularly for Asian people, and rice demand also increases for non-Asian people. Rice provides the bulk daily calories for humans and animals. One of the problems in SRI method is weed. Many efforts to control weed in the SRI method and one of the way island flooding before planting. The objective of the research was to study the land flooding effect before planting in controlling weed to yield components of several rice varieties. The research was conducted in farmer land of Kuranji and Laboratory of Weed Science, Department of Crop Sciences, Faculty of Agriculture, Andalas University, Padang, West Sumatera, Indonesia from June to September 2019. A randomized block design was used in the experiment. 5 rice varieties (Batang Piaman, Panca Redek, PB 42, Batang Pasaman, and Saganggam Panuah) were used as treatments. The treatments were replied three times. Generally, the result showed that land flooding before planting affected the yield component of rice. For the length of the panicle, Panca Redek and Saganggam Panuah were the best variety (30.18 cm and 20.91 cm, respectively). For the weight of 1000 grains, Batang Piaman was the best variety (35.67%), and Batang Piaman was also the best variety for the weight of dry grain (28.33). For production per hectare, Batang Pasaman, Batang Piaman, and Saganggam Panuah were the best variety (5.04 ton, 4.92 to and 3.88 tons respectively).