Effect of weather on grain yield of direct seeded upland rice varieties in Jharkhand, India

Abstract

The study was conducted at Birsa Agricultural University, Ranchi during the years 2009-2013 for understanding the effect of weather variables on the yield of three direct seeded upland rainfed rice varieties viz., Vandana, BVD-109 and BVD-111 in Jharkhand. Correlation and regression methods were used to estimate the impacts of weather on rice yield. Study indicated that temperature, rainfall and sunshine hours have significant effect on the rice yield. Average minimum temperature during sowing to vegetative stage in cv. Vandana and during flowering in BVD-109 and BVD-111 showed significant negative relationship with yield. Rainfall during vegetative and grain filling stage are significantly and positively related with grain yield in all the three rice varieties. The effect of sunshine hours on grain yield of rice was comparatively higher at milk stage than the other phenological stages in all three varieties. However, the effect of sunshine hours on yield is significant during the milk stage in Vandana and BVD-111 only. Multiple regressions using critical weather parameters in critical stages of the three varieties could explain the variability in yield of Vandana, BVD-109 and BVD-111 by 92, 74 and 91 percent, respectively.

Application of CSM–CERES–Rice in scheduling irrigation and simulating effect of drought stress on upland rice yield

“…Therefore, optimum dose of fertilizer was applied at the rate of 25 kg N, 15 kg P and 15 kg K + ha -1 in three splits at 37, 45 and 57 DAP. Primary atmospheric variables that impact on crop growth and grain production are solar radiation, air temperature, humidity, and precipitation (Kumari et al, 2017). During the season, maximum and minimum temperature ranged between 31.3 to 44.5 ºC and 23.0 to 27.3 ºC and solar radiation ranged between 7.6 to 25.8 MJ m -2 day -1 respectively (Fig 1).…”

Rice phenology and growth simulation using DSSAT- CERES-Rice crop model under the different temperatures changing with climatic condition

“…Impact of primary atmospheric variables on crop growth, development and grain production were rainfall, solar radiation, air temperatures, humidity, and precipitation. Reported by Kumari et al (2017). Figure 1 showed that weather conditions had no visible variations.…”

​Influence of Iron Coated Seeds on Time of Sowing in Wet Direct Seeded Rice (Oryza sativa L.)

“…The seed density required for direct seeding should be determined not only by field conditions but also by cultural practices. Field conditions may include water movement as affected by wind speed and soil physical surface conditions (Pragyan Kumari et al, 2017). The density required in the continuous flooding of water seeding might be greater than that required delayed flooding (Yamuchi, 2017).…”