Study of end drainage in an intermittent flooded lowland rice area at Rio de Janeiro State
DOI:
https://doi.org/10.1590/S1678-3921.pab1977.v12.16767Keywords:
epoche drainage, and drainage, irrigated rice, intermittent irrigation, epoche irrigation, agricultural engineering, food irrigationAbstract
A water management study in paddy rice (Oryza sativa L.) was carried out in a series of "Guandu" low humic gley soil. Aspects of yeld, grain quality, water economy and labor reduction, related to four epoches (20, 25, 30 and 35 days after the beginning of heading) of end drainage, was performed for rice cultivars "De Abril" and IAC. 435 from1969 to 1973. Results indicated that the tested and drainage epoches had no influence on yelds in both cultivars. The most economic period to save water and reduce labor would seem to be 20 days after the reading stage. All treatments influenced grain quality in the De Abril cultivar. End drainage at 25 days after the beginning of heading produced grain of the beat milling quality in cultivar IAC 435. Precipitation, temperature, relative humidity and insolation, were recorded throughout the experiments.
