2016
DOI: 10.5539/jas.v9n1p1
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Effects of Varied Nitrogen Supply and Irrigation Methods on Distribution and Dynamics of Soil NO3-N during Maize Season

Abstract: A field experiment was carried out to investigate the effects of different supply methods of nitrogen (N) fertilizer and irrigation on the spatial distribution and dynamics of soil NO 3 -N for maize (Zea mays L.) grown in northwest China in 2012 and 2014. In 2012, there were three irrigation methods: alternate furrow irrigation (AI), fixed furrow irrigation (FI) and conventional furrow irrigation (CI). Three N supply methods: alternate N supply (AN), fixed N supply (FN) and conventional N supply (CN), were app… Show more

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Cited by 5 publications
(3 citation statements)
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“…However, the negative correlations between grain yield and RWD in deep soil layers (60–100 cm) were observed at almost all measured growth stages although none of these correlations were statistically significant (Table 4). We speculate that because of the low N concentration in these soil depths 26 , the nutrient uptake by plant is limited while the photosynthate input required to grow those roots is not reduced 41 . This suggests that the plant does not receive a good “return on investment” for growing the roots.…”
Section: Discussionmentioning
confidence: 93%
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“…However, the negative correlations between grain yield and RWD in deep soil layers (60–100 cm) were observed at almost all measured growth stages although none of these correlations were statistically significant (Table 4). We speculate that because of the low N concentration in these soil depths 26 , the nutrient uptake by plant is limited while the photosynthate input required to grow those roots is not reduced 41 . This suggests that the plant does not receive a good “return on investment” for growing the roots.…”
Section: Discussionmentioning
confidence: 93%
“…CN increased the root growth compared with CK; this was attributing to the alternation of wet and dry compartments, which resulted in compensatory root growth in the re-watered compartment after previous exposure to soil drying 17 . Moreover, it has been proved that soil N concentration in the 0–40 cm soil layer south of plant (N supplied) under FN was almost twice that under CN 26 . However, in the present study, RWD in the 0–40 cm soil layer at the VT, R 2 and R 6 stages south of the plant (N supplied) were not enhanced while the RWD north of the plant (no N supplied) were significantly reduced (Fig.…”
Section: Discussionmentioning
confidence: 99%
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