Results
At sowing total soil N and its fractions were not significantly.
Similarly, N content in crop residues was not significantly different between treatments (Table 1).
In contrast, the biomass of crop residues was significantly higher in the NT 50N plot and lower in CT 0N.
At harvest,total soil N and its fractions except NO3 were not significantly different.
NO3 was significantly lower in NT 140N than in the NT 50N.
Crop residue nitrogen concentration did not differ among treatments, whereas N concentration in the grain was
significantly lower in NT 50N than in the remaining treatments (Table 2).
Similar to the biomass of crop residues at sowing (Table 1),
the biomass of crop residues at harvest also differed significantly among treatments (Table 2),
with the NT 140N plot generating the highest biomass.
The amount of N in the different fractions was significantly lower at harvest in most treatments.
Total N in the soil did not vary significantly between harvest and sowing except in NT 140N, being higher at sowing (Fig. 1a).
Crop residue N content did not vary in NT 25N or NT 140N, whereas in CT 0N, this parameter was higher at harvest and in NT 50N it was higher at sowing (Fig. 1b).
The more labile and soluble soil N fractions (microbial biomass N, NO3-N and NH4-N) were significantly higher at sowing than at harvest in all treatments (Fig. 1c–e).
Microbial biomass N changes ranged between 68 and 90%. Decreases in NO3-N ranged between 46 and 82%,
whereas NH4-N changed between 78 and 91%.
Grain yield was higher in NT 140N and lower in CT 0N; grain N recovery was higher in NT 25N.
In contrast, agronomic efficiency values were higher in NT 50N (Table 3).
N balance was negative in the four treatments analyzed.
The amount of N lost in the 0–20 cm soil was highest in NT 140N plot and lowest in NT 25N (Table 3).
Results
At sowing total soil N and its fractions were not significantly.
Similarly, N content in crop residues was not significantly different between treatments (Table 1).
In contrast, the biomass of crop residues was significantly higher in the NT 50N plot and lower in CT 0N.
At harvest,total soil N and its fractions except NO3 were not significantly different.
NO3 was significantly lower in NT 140N than in the NT 50N.
Crop residue nitrogen concentration did not differ among treatments, whereas N concentration in the grain was
significantly lower in NT 50N than in the remaining treatments (Table 2).
Similar to the biomass of crop residues at sowing (Table 1),
the biomass of crop residues at harvest also differed significantly among treatments (Table 2),
with the NT 140N plot generating the highest biomass.
The amount of N in the different fractions was significantly lower at harvest in most treatments.
Total N in the soil did not vary significantly between harvest and sowing except in NT 140N, being higher at sowing (Fig. 1a).
Crop residue N content did not vary in NT 25N or NT 140N, whereas in CT 0N, this parameter was higher at harvest and in NT 50N it was higher at sowing (Fig. 1b).
The more labile and soluble soil N fractions (microbial biomass N, NO3-N and NH4-N) were significantly higher at sowing than at harvest in all treatments (Fig. 1c–e).
Microbial biomass N changes ranged between 68 and 90%. Decreases in NO3-N ranged between 46 and 82%,
whereas NH4-N changed between 78 and 91%.
Grain yield was higher in NT 140N and lower in CT 0N; grain N recovery was higher in NT 25N.
In contrast, agronomic efficiency values were higher in NT 50N (Table 3).
N balance was negative in the four treatments analyzed.
The amount of N lost in the 0–20 cm soil was highest in NT 140N plot and lowest in NT 25N (Table 3).
การแปล กรุณารอสักครู่..