Table 1.
Fertilizer doses applied per irrigation (kg·hm-2).
Fig 1.
Set-up to collect leachate.
Fig 2.
Total N, NO3-, NH4+ and total P loss under four treatments (kg hm-2).
Data were mean ± standard error (n = 3). Different lowercase letters indicate significant differences among treatments at P<0.05 level. Bars mean standard e1rrors.
Table 2.
Nitrogen and phosphorus loss coefficients, by treatments and growing season (%).
Table 3.
Summary statistics of regression analysis of the nitrogen or phosphorus relationship among different treatments.
Fig 3.
Nitrogen and phosphorus uptake of cotton under four treatments (kg hm-2).
Note: Data were mean ± standard error (n = 3). Different letters within a column indicate significant differences among treatments by ANOVA followed by Duncan’s test (p ≤ 0.05). The corresponding results are presented in Table 3.
Fig 4.
The relationship between nitrogen and phosphorus loss index and nitrogen and phosphorus fertilizer application.
The fitting relationship is selected to fit with larger correlation coefficient in the above figure.
Table 4.
The correlations between the total nitrogen, total phosphorus absorption by cotton and loss of nitrogen and phosphorus in leaching water (kg hm-2).
Table 5.
Cotton yield in different years under different treatments (t hm-2).