グレインソルガムにおける再生茎の生産性について

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The purpose of this study was to increase both grain and forage yields of grain sorghum by stimulation of adventitious buds by cutting the main stem (ratoon cropping system). The seeds of grain sorghum (Sorghum bicolor (L.) MOENCH) hybrid H-726 were sown on May 15 in 1/2000 a Wagner's pot under glasshouse conditions at the Nagoya University Experimental Farm and the plants were harvested on October 16. According to the treatments the main stem of the plants were cut on internode 7 (lower cutting) or internode 12 (upper cutting) when plants reached flag leaf stage (early cutting) or 10 days after heading (late cutting). After cutting, the plants were divided into two groups, irrigated and water stressed. To reach first wilting conditions in the water-stressed plants, irrigation was suspended 5〜6 days when longest tiller reached 12 leaf stage. The soil was fertilized prior to planting with 2g urea, 10g, fused phosphatic fertilizer and 6g potassium chloride. The additional fertilizer was applied as urea, 2g at 6th leaf emergence stage, 2g after cutting and 2g each when longest tiller reached 6th leaf emergence stage and at heading stage. The results obtained are as follows : 1. Forage yield of cutting part was heavier in lower cutting than in upper cutting treatments and also it was higher in late cutting than in early cutting treatments. 2. The remaining stem after cutting was 1.5cm in lower cutting treatments and the percentage of living plants was 30-60% while in upper cutting treatments the remaining stem was 16-17cm and living plants 100%. 3. The tillers appeared on nodes 5-6 and 5 to 11 in lower and upper cutting treatments respectively. There were variations in growth and yield of tillers in the various positions of the plant. 4. The grain and total forage yields and their nitrogen contents were higher in irrigated plants than in water-stressed plants. 5. The grain and total forage yields and their nitrogen contents were greater in upper cutting treatments than in lower cutting treatments. The yields of grain and total forage were heavier in late cutting treatments than in early cutting treatments due to smaller number of living plants in early cutting treatments but the opposite was true for percentage of grain crude protein. 6. Compared with non-cutting treatment (control), total forage yield and its nitrogen content increased in plants which were cut at any stage of growth and at any height. The grain yield and its nitrogen content decreased in lower cutting treatments but increased in upper cutting treatments.
日本作物学会の論文
1980-07-31

グレインソルガムにおける再生茎の生産性について

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