Agriculture Reference
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Crotalaria breviflora
0 mg N kg -1
200 mg N kg -1
FIGURE 3.2
( See color insert. ) Growth of cover crop Crotalaria breviflora at low and high N levels.
in growth of these cover crops at 0 mg N kg −1 compared to 200 mg N kg −1 is visible. Similarly, root
growth of cover crops at low and high N levels is shown in Figures 3.6 through 3.8. Root growth
at 200 mg N kg −1 was much more vigorous compared to 0 mg N kg −1 . Figure 3.9 shows a plot with
N deficiency symptoms and a plot without N deficiency symptoms grown on a Brazilian Oxisol.
Similarly, Figure 3.10 shows N deficiency symptoms in dry bean and Figure 3.11 shows dry bean
plants growth without N and with N application. Similarly, deficiency nitrogen deficiency symptoms
are very clear in plants that did not receive N application. Figure 3.12 shows the growth of dry bean
and corn at low (control) and high (200 mg N kg −1 ). Both the species show yellowing of the leaves
at low N levels. Figures 3.13 and 3.14 show the growth of upland rice at two N levels. Nitrogen defi-
ciency is very clear in the plants that did not receive N fertilization. Similarly, root growth of upland
rice as influenced by N fertilization is shown in Figures 3.15 through 3.17. Root growth of these
upland rice genotypes was much more vigorous at 300 mg N kg −1 compared to the control treatment.
Crotalaria mucronata
0 mg N kg -1
200 mg N kg -1
FIGURE 3.3
( See color insert. ) Growth of cover crop Crotalaria mucronata at low and high N levels.
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