Variation in proximate principles and correlation studies in Grewia optiva along altitudinal gradient in Garhwal Himalaya

Grewia optiva is known for its fodder value in Garhwal Himalaya. Its leaves were harvested in the loping season from upper (above 1600 m), middle (1300–1600 m) and lower (1000–1300 m) altitudinal ranges to determine variation and relation of proximate principles with altitude and diameter classes. The data revealed that the proximate principles were strongly influenced by the altitudinal gradient. The correlation coefficient showed significant positive relation between altitude and dry matter (R<0.01) and negative with ash content (R<0.01). Diameter class showed significant positive relation with ether extract and crude fibre while negative relation with dry matter, crude protein and ash content. Highest crude protein and low crude fibre contents were observed at the mid-altitude and the higher altitude had better dry matter, ether extract, crude fibre and nitrogen free extract contents. On an average, in mid altitude range, leaves had better nutrient content than other selected range of altitudes. Therefore, it was suggested that the trees growing in this range of altitude should be harvested for better nutrition to the livestock.