The research investigated and evaluated in this book provides the valuable information for the students, researchers and scholars. This book can serve as a valuable guide for improving the rice yields viz-a-viz conserving the irrigation water. The evaluation of this crop in respect of different spacings and seedlings per hill can give a clear cut figure of the two interrelated parameters for the yield improvement of the said crop as well as microclimatic conditions in the crop canopy. The quantification of meteorological parameters like the intercepted photosynthetically active radiation (PAR), temperature and relative humidity within and outside the canopy using different treatment combinations (Spacings and Seedlings per hill) can give a clear cut picture of crop health as well as yield advantage of the Oryza sativa.