| Effects of nitrogen fertilizer forms on soil enzyme activities at different growth stages of wheat |
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| DOI：10.7606/j.issn.1000-7601.2013.06.018 |
| Key Words: nitrogen fertilizer form winter wheat soil enzyme activity dryland |
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| Abstract: |
| A field experiment was carried out to study the effects of nitrogen (N) fertilizer forms on soil enzyme activities at different growth stages of wheat. The results showed, during the whole growing season of wheat, the activities of urease and protease presented a two peak curve, while the activities of invertase, dehydrogenase and catalase demonstrated an inverted S-curve (i.e., decreasing-rising-decreasing), U-curve (i.e., being high at overwintering and maturity stage but low at other stages), and inverted L-curve (i.e., being risen sharply after reviving stage but decreased slowly after jointing stage), respectively. The enzyme activities in 0～20 cm layer of soil were g
enerally higher than those in 20～40 cm layer. N application significantly improved soil enzyme activities, in which the activities of urease, protease, invertase, dehydrogenase and catalase were elevated by 60.3%, 36.0%, 36.7%, 100% and 33.8% on average, respectively. The average values of coefficient of variation of soil enzyme activities were sequenced as: urease > dehydrogenase > protease > invertase > catalase. The effects of N fertilizer forms to soil enzyme activities
at different stages of wheat were different, but there was no definite regularity. |
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