Author : Gloria, Ricardo T.

Summary : Three grain sorghum cultivars were grown in the open field and under seven-and -two-year old rubber trees at three levels of nitrogen fertilizer and plant population density, to determine their performance in both seed and ratoon crops in terms of grain yield and other agronomic characters, quality parameters like protein and total starch content of grains and their effects on stem girth and latex yield of rubber. Comparing the six cultural environments with respect to the parameters evaluated, those grown in the open field and under two-year old rubber trees namely, MIT open field seed crop, MIT-open field ratoon crop, Kidapawan-under rubber seed crop and Kidapawan-under rubber ratoon crop reduced the number of days to blooming, and gave higher grain and total dry matter yields, 100-grain weight and number of grains per panicle.