A Farmer's Primer on Growing Upland Rice. by M.A. & Vergara, B.S. Arraudeau

By M.A. & Vergara, B.S. Arraudeau

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Additional info for A Farmer's Primer on Growing Upland Rice.

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Are generally short-lived.

Their color turns light bluegreen or whitish. The ability to recover after long drought stress is an important character of a good upland variety. 51 Roots Upland versus lowland rice varieties 55 Origin of roots 56 Crown roots 57 Root hairs 58 Root functions 59 Root development 60 Root development at 40 days after sowing 61 Root development at 60 days after sowing 62 Root development at heading 63 Root distribution 64 Root distribution depends on depth of topsoil 65 Root distribution depends on depth of plowed layer 66 Root distribution depends on soil composition 67 Root distribution depends on availability of air and water Root distribution depends on fertilizer placement 69 Thick and deep roots help plants withstand drought 70 68 Upland versus lowland rice varieties • • Most tall, traditional upland rices have deeper, thicker, and fewer roots than lowland rices.

Plants grow faster at warm temperature than temperature. in poor at cool 29 Light intensity • • • 30 Less light can cause the leaf blades and sheaths to elongate. The taller plants are weaker and will "lodge" or fall over if their panicles become heavy with grain. Plants produce food from light, water, and air. Less light means less food, which results in weak seedlings. Seedlings grow better when sunlight is bright. Low light intensity • Low light intensity results in 31 Available nutrients • • 32 Fertilizers supply nutrients (plant food) in addition to what is already available in the soil.

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