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Effect of nitrogen rate and stubble height on dry matter yield, crude protein content and crude protein yield of a sorghum-sudangrass hybrid Moench X Sorghum sudanense Stapf in the three-cutting system



Effect of nitrogen rate and stubble height on dry matter yield, crude protein content and crude protein yield of a sorghum-sudangrass hybrid Moench X Sorghum sudanense Stapf in the three-cutting system



Journal of Agronomy and Crop Science 189(4): 227-232



In this study, the effects of nitrogen (N) rate (60, 120, 180 and 240 kg N ha-1 applied in three equal dressings at seeding and after the first and second cuttings) and stubble height (7, 14 and 21 cm) on the dry matter (DM) yield, crude protein (CP) content, and CP yield of a sorghum-sudangrass hybrid (Sorghum bicolor (L.) Moench X Sorghum sudanense (Piper) Stapf., cv. Pioneer 988) in the three-cut system was investigated. The N rate had no significant effect in the first and third cuttings, but in the second cutting DM yields increased significantly with increase in N rate. The highest yield of 9.1 t ha-1 was obtained with 80 kg N ha-1 for the average of 2 years at the second cutting, but no significant difference was found among the 40, 60 and 80 kg N ha-1 rates. CP content and yield were not significantly affected by N rate at the first and third cuttings, but CP content and yield were significantly affected by application of N at the second cutting. Stubble height had a significant effect on CP content at the third cutting. However, it had no significant effect on CP content at the first and second cuttings. Stubble height had a significant effect on the CP yield at the first cutting, but no significant effect on CP yield at the second and third cuttings.

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