Effect of stocking rate on soil animal and microorganisms, inorganic nitrogen contents in soil, herbage production and nitrogen intake by dairy cows
2005
Takahashi, M.(Hokkaido Univ., Sapporo (Japan)) | Ueda, K. | Nakatsuji, H. | Kondo, S.
Under rotational grazing by dairy cows, effect of stocking rate on soil animal, soil microorganism, inorganic nitrogen contents in soil, herbage production and nitrogen intake were evaluated using five perennial ryegrass-dominant pastures. Each pasture was grazed at once every fifteen days from early July to early October. The stocking rate of each pasture was 10, 20, 30, 40 and 50 cow-hr/ha/day, respectively. In stocking rate 10-40 cow-hr/ha/day, the number of soil animals and herbage regrowth tended to increase with increasing the stocking rate, and consequently, herbage production and nitrogen intake increased, although soil microorganisms and inorganic nitrogen contents in soil had little differences. However, in stocking rate 50cow-hr/ha/day, herbage production and nitrogen intake were lower than in stocking rate 40 cow-hr/ha/day, because herbage regrowth was lower than stocking rate 40 cow-hr/ha/day, and the number of soil animals and inorganic nitrogen contents in soil were the lowest in all stocking rate-treatment.
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