Study on yield and quality of Pangola grass (Digitaria decumbens Stent.)
1997
Nipon Pachanavan
Pangola (Digtaria decumbens Stent.) is an important grass in the tropics and its potential as a pasture hay appeare to be promising in Thailand. This thesis was carried out in three experiments under field conditions. The objectives of these studies were to obtain the basic information on the response of pangola grass to nitrogen applications and to cutting at different frequencies and intensities in therms of quantity and quality of herbage produced. The results from the first experiment showed that total dry matter yield was increased with nitrogen application up to 1 50 kg N/rai. However, there was not significant effects of frequency of defoliation on dry matter production. Crude protein contents were increased with nitrogen fertilizer application. In contrast, the phosphorus concentration was decreased while levels of potassium, calcium, ADF and NDF were slighly affected by nitrogen applications. Cutting frequency significantly increased the level of crude protein, phosphorus and potassium but there was little effect on calcium. ADF and NDF contents. The second experiment showed that close cutting (0-5 cms) gave a higher production than lax cutting (15-30 cms). Crude protein, potassium and calcium contents were increased with higher cutting level while levels of phosphorus, NDF and ADF tended to reduce. The last experiment showed that there was little effect of different sources of nitrogen on dry matter yield. However, crude protein content was higher in ammonium sulphate treatment than of urea treatment. Split application of nitrogen fertilizer gave better yield than that of single one.
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