Forage production in sorghum and millet: growth variables.
Six commercial varieties of sorghum (Sorghumvulgare) and one of millet (Pennisetum americanum), as wellas six millet lines from The International Crop ResearchInstitute for the Semiarid Tropics (ICRISAT), Hyderabad,India, were evaluatedTo identify materials of sorghum andmillet suitable for forage production during the springsummerperiod, and to determine the determinants of cropyield,. Crop Growth Rates (CGR), Relative Growth Rates(RGR) and Net Assimilation Rates (NAR) were estimated.Total Dry Matter (TDM) was positively and highly correlatedto CGR in both harvests, but TDM was not significantlycorrelated with RGR or NAR during the first harvest. Theonly significant correlation during the second harvest wasbetween TDM and NAR (-0.730). CGR in the second harvestwas highly correlated (r = 0.932) to Leaf Area Index (LAI)during this harvest, but not during the first one. The largestcorrelation observed for CGR during this harvest was withcrop height at first harvest (r = 0.763). For both harvests LAIand Specific Leaf Area correlated directly with TDM in ahighly significant manner, while Leaf Weight Ratiocorrelated inversely TDM. It was concluded that CGR wasthe main determinant of dry forage yield.
| Main Authors: | , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad de Costa Rica
2004
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| Online Access: | https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11931 |
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| Summary: | Six commercial varieties of sorghum (Sorghumvulgare) and one of millet (Pennisetum americanum), as wellas six millet lines from The International Crop ResearchInstitute for the Semiarid Tropics (ICRISAT), Hyderabad,India, were evaluatedTo identify materials of sorghum andmillet suitable for forage production during the springsummerperiod, and to determine the determinants of cropyield,. Crop Growth Rates (CGR), Relative Growth Rates(RGR) and Net Assimilation Rates (NAR) were estimated.Total Dry Matter (TDM) was positively and highly correlatedto CGR in both harvests, but TDM was not significantlycorrelated with RGR or NAR during the first harvest. Theonly significant correlation during the second harvest wasbetween TDM and NAR (-0.730). CGR in the second harvestwas highly correlated (r = 0.932) to Leaf Area Index (LAI)during this harvest, but not during the first one. The largestcorrelation observed for CGR during this harvest was withcrop height at first harvest (r = 0.763). For both harvests LAIand Specific Leaf Area correlated directly with TDM in ahighly significant manner, while Leaf Weight Ratiocorrelated inversely TDM. It was concluded that CGR wasthe main determinant of dry forage yield. |
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