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Read e-book online A Farmer's Primer on Growing Upland Rice. PDF

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

ISBN-10: 9711041707

ISBN-13: 9789711041700

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49 Leaf production • • • 50 Rice leaves on the main stem are produced one at a time. A new leaf is produced about every 7 days. A new rice leaf grows on the opposite side of the leaf before it. Effect of drought on leaves • • The leaves curl during drought. 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.

Good seedlings have uniform height 37 Good seedlings have more roots that are longer and heavier 38 Good seedlings have uniform height • Irregular seedling growth may indicate – uneven distribution of seeds during seeding. – uneven germination of seeds. – poor land preparation. – variable rainfall. – uneven soil particles. – different levels of nutrients (plant food) in the soil. 37 Good seedlings have more roots that are longer and heavier • 38 Heavy seedlings become stronger plants as they grow older.

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.

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


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