Effect of Light Intensity on Paddy and Wheat Grain Yield under Eucalyptus Tereticornis Sm. Based Agri-silvicultural System

An investigation was under taken to monitor the performance of tree growth and crop yields of paddy and wheat under Eucalyptus tereticornis Sm. based agri-silvicultural system at farmer's field of Amaniganj block of Faizabad district. The -1 -1 average annual growth in tree height and dbh were 1.24 m and 0.89 cm tree yr , respectively. The light intensity recorded was maximum in open crop than under tree canopy. The results indicated that paddy grain yield was 14.7- -1 -1 19.7% less under tree canopy (1.99 t ha ) than open area (2.34 t ha ). However, under tree canopy, the wheat grain yield -1 (1.49 t ha ) was 26.4-34.6% lower than that of open cultivation. It is evident from the experiment that paddy tolerates little suppression of reduced light under tree canopy and does not face too severe decline in grain yield. On contrary, wheat being a strong light demander experiences relatively greater suppression in grain yield.