| Effects of deep moisture and fertility regulation on main physical properties of soil and yield of maize in dryland regions in western Liaoning Province |
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| DOI：10.7606/j.issn.1000-7601.2013.01.02 |
| Key Words: deep straw placement deep fertilizer application mai
ze yield increase |
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| Abstract: |
| In view of the problems of drought, shallow plough
layer and low fertility in the arable soil of dryland regions in western Liaoni
ng Province, the experiment of integrated technologies of mechanized deep straw
placement, deep fertilizer application and no-till planting of maize were carri
ed out. The results showed that: (1) The variation range of bulk density of surf
ace soil under deep straw placement and deep fertilizer application was 1.25～1.
27 g·cm-3, and there was a significant difference among the treatments in
the soil layer of 10～20 cm, while the soil bulk density of the control was 1.5
5～1.57 g·cm-3. The soil bulk density in the layer with centralized straw
placement was lower than 1.2 g·cm-3 and more stable. (2) The soil wa
ter
content in 2010 increased with the increment of tillage depth under deep straw p
lacement and deep fertilizer application, but it suddenly decreased to 11.45% in
20-30cm soil layer under deep straw placement due to the water absorption of st
raw. In 2011 when the rainfall reduced from 193.9 mm to 35.1 mm, the soil water
content in all layers under these two treatments was higher than that under the
control, and in straw concentration layer it still remained at 16.39%. (3) In 20
10, the average yield of maize was 13 094.3 kg·hm-2 and 12 782.66 kg·hm
-2 under deep straw placement and deep fertilizer application respectively
, being increased by 9.04% and 6.44% respectively compared with that under the c
ontrol. In 2011, although the annual rainfall was 158.8 mm lower than that in 20
10, the average yield of maize could still reached at 12 053.10 kg·hm-2 a
nd 11 523.45 kg·hm-2 respectively under these two new technologies, with
a increase rate of 9.64% and 4.82% respectively compared with that under the con
trol. te of 9.64% and 4.82% respectively compared with that under the control. |
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