Stand Establishment - 73
 

 

 

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Project Leader and Principal UC Investigators

M.L. Peterson, J.N. Rutger, Physiological & Genetic Determinants of Yield and Quality in Rice (RB3)

D. Jones

R.C. Buckman

S.S. Lin

L. Kramer

C.C. Li

S. Trees

S. Khan

K. Foster

K. Taggard

 

BLANKING RESISTANCE NEEDS IMPROVED TESTING TECHNIQUE

Blanking resistance is hard to evaluate in the field because the minimum temperatures vary nightly. Facilities are being developed to permit screening under conditions of controlled temperatures. (CCRRF)

SCREENING FOR LOW-TEMPERATURE SENSITIVITY

Understanding progresses on low-temperature-induced sterility in rice, but. better methods are needed of screening for resistance to temperature extremes. Work on cold tolerance of rice seedlings is progressing nicely. Since most short-stature sources are sensitive to low temperatures in the seedling stage, attempts are being made to combine short stature with seedling vigor at low temperatures. (RB3)

þ ESPECIALLY IMPORTANT IN LATE SEASONS

To minimize blanking: 1) raise water 2 inches higher than your normal depth when plants are at the sensitive stage (about 3 weeks before heading) 2) minimize spilling so that added cooler water will be minimal; 3) about a week before heading, reduce water intake so water sinks to original 6-inch depth. Those procedures are recommended where blanking has been a problem, especially in cooler areas.

 

THE SENSITIVE STAGE is shown by the middle panicle in both photos with the flag-leaf collar (left arrow) and the second-leaf collar (right arrow) at equal heights. Earlier, the flag-leaf collar is lower; and later it is higher.

 

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