Abstract
AbstractIn a study conducted in 1975, sterility in rice (Oryza sativa L.) cultivars grown on Crowley silt loam soil (Typic Albaqualf) amended with monosodium methanearsonate (MSMA) increased as cultivar susceptibility to straight‐head increased. A midseason drain and dry treatment was found to decrease MSMA induced sterility. This study was a continuation of the experiment initiated in 1975 to evaluate the residual effects of the 1975 MSMA application on rice growth and yield 2 and 4 years later for two water management schemes. Two rice cultivars (‘Lebonnet’ and ‘Nova 76’ or ‘Mars’) of different straighthead resistance were grown in rotation with ‘Lee 74‘ soybean (Glycine max L. Merr.). Two years after application of MSMA, sterility and decreased yield were observed under continuous flood for the 11.2 kg arsenic/ha rate with the straighthead susceptible cultivar (Nova 76) being damaged more severely. No damage was found at this arsenic (As) rate for the midseason draining and drying treatment, a common straighthead control practice, or for either water management at the 1.1 kg As/ha rate. Four years after MSMA application, no sterility or yield reduction were noted in any treatment. These data suggest that where rice production is desired on a silt loam soil previously treated with MSMA crop rotation, in addition to cultivar selection and water management, could be used to minimize yield loses due to sterility.
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