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Cultivar Differences in Milling Yields under Delayed Harvesting of Rice

International Rice Testing Program for Latin America, CIAT, Apartado Aereo 6713, Cali, Colombia

^* Corresponding author.

Evaluation of milling performance of rice (Oryza sativa L.) cultivars often has resulted in a wide range of values depending on the growing environment, and harvesting and drying methods. A common stress affecting milling yield evaluations is the delay in harvesting. This experiment was designed to evaluate the performance of 16 rice cultivars under 2 wk of harvest delay. Cultivar plantings were staggered to obtain simultaneous maturity during three consecutive seasons at Palmira, Colombia. A combination of harvesting and threshing-time treatments was used. Harvesting was done at maturity, and 1 and 2 wk later. Threshing was done immediately after harvest and with a delay of 4 d. Total milled- and head-rice yields were measured. Cultivar response to delayed harvesting followed four patterns ranging from constant head-rice yields throughout the period to significant weekly reductions. Threshing delays reduced head-rice yields by an average of 5.8% for all cultivars. Total milled-rice yields was reduced 3% across cultivars by a 2-week delay in harvest or by a 4-day delay in threshing. Cultivar performance patterns detected could be used to check the reaction of other cultivars for harvest delay effects.

Received for publication November 28, 1988.