Abstract
Phytase activity in the rhizosphere of different crops, trees, and grasses were compared in an arid environment as affected by temperature and tillage. The rhizosphere activity was increased 37–103% compared to fallow soils (controls). Legumes contributed significantly more than pearl millet ( Pennisetum americanum). Neem, Azadirachta indica, had highest phytase activity among the trees, and sewan grass, Lasiurus sindicus, resulted in more activity among grasses. A strong linear regression ( r 2=0.896; p<0.001) between the phytase activity and depletion of phytin P in the rhizosphere was observed. The activity was more under no-tillage than tillage conditions in annual crops and maximum at 35°C. Some phytase fraction probably was resistant to temperature treatments. This study indicates that phytase released in different plant rhizospheres had different temperature optima.
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