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Effects of urea types and irrigation on crop uptake, soil residual, and loss of nitrogen in maize field on the North China Plain

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Figure

Figure 1. Precipitation and air temperature during the maize growth stages in 2006 and 2007 and the long-term  average
Figure 2. Content of NO3–-N in 0~140 cm soil layer at the maize 14th leaf stage in 2006 and 2007
Figure 3. Content of NO3–-N in 0~140 cm soil layer at the maize silking stage in 2006 and 2007
Figure 4. Content of NO3–-N in 0~140 cm soil layer at the maize physiological maturity stage in 2006 and 2007
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