| Dynamics of soil enzyme activity and N and P content under different fertilizer rates in maize field with full plastic film mulching on double ridges and planting in catchment furrows |
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| DOI：10.7606/j.issn.1000-7601.2013.05.010 |
| Key Words: maize with full plastic film mulching on double ridge
s and planting in catchment furrows fertilizer application enzyme activity N
and P nutrient dynamic change |
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| Abstract: |
| To further improve maize technical system with ful
l plastic film mulching on double ridges and planting in catchment furrows, the
field experiment was conducted to determine the dynamic response of the enzyme
activity and the content of N (nitrogen) and P (phosphate) in two soil segments
(0 to 20 cm and 20 to 40 cm) to different N and P fertilizer application rates,
using a randomized complete block design with three replications. The results re
vealed that the activity of soil urease, phosphatase and invertase as well as th
e content of soil available N and available P consistently followed a rapid incr
easing trend during the early growing period of maize. The activity of urease, i
nvertase and catalase and the content of available N peaked at jointing stage,
while the highest value of phosphatase activity and available P content occurred
at tasselling stage. However, the activity of various soil enzymes and the cont
ent of N and P declined during the late growing period. There existed positively
significant (P<0.05) or extremely significant (P<0.01) correlations b
etween urease activity and N and P content as well as between alkaline phosphata
se activity and available P content. Invertase activity is positively correlated
to available N and P content at significant (P<0.05) level. There was no si
gnificant correlation between catalase activity and N and P content, as well as
between alkaline phosphatase activity and available N. In the arid or semiarid a
reas of northwest China, the optimal fertilizer application rate for maize with
full plastic film mulching on double ridges and planting in catchment furrows w
as N 210 kg·hm-2 and P2O5 168 kg·hm-2 when the plant density was 6.75×104 plant·hm-2. |
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