The effect of nitrogen fertilization and seed deterioration on grain yield and other agronomic parameters of grain sorghum, Sorghum bicolor (L.) Moench [study conducted at CMU, Philippines]
1981
Galan, J.M. | Pava, H.M. | Fonollera, V.C. (Central Mindanao Univ., Musuan, Bukidnon (Philippines))
Sorghum seeds were artificially aged from 0, 30, 40, 50 and 60 hours using accelerated technique. The aged seeds were planted in the field and applied with different levels of nitrogen. Result of laboratory tests performed on deteriorated seeds showed that germination, speed of germination, seedling height, and seedling dry matter weight decreased with increaseing lenght of exposure to accelerated aging. Nitrogen was found to have marked influence on increasing plant height, dry matter yield, weight of straw, weight of panicle and grain yield. Optimum level which gave the highest yield was 120 kgs N per hectare. Planting deteriorated seeds caused reduced plant heigth, less dry matter and reduced yield. Deterioration was found to have a greater influence on panicle development rather rather than on straw development. Grain yield was significantly reduced ranging from 21.0 to 55.8 % compared with the control. The critical level of deterioration based on germination % was found to 81%. Nitrogen was found to offset the yield reduction due to seed deterioration only on less deteriorated seeds. Its effect on highly deteriorated seeds was depressive. Regression analysis revealed that % germination, speed of germination and seedling height could be reliable indices of seed quality since they show direct relationship with yield performance of sorghum
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