Diagnostic Techniques for Nitrogen Requirements in Crop Plants - Nitrogen Management in Crop Production - page 140

TABLE 3.8
Uptake of Nitrogen in the Shoot and Grain of 19 Upland Rice Genotypes at Two N Levels

N Uptake in Shoot (mg Pot − 1 ) N Uptake in Grain (mg Pot − 1 )

Genotype 0 mg N kg − 1 400 mg N kg − 1 Across Two N Levels

CRO 97505 100.0abc 473.1a 409.0a

CNAs 8993 93.5abc 363.4a 513.5a

CNAs 8812 117.7abc 574.5a 510.3a

CNAs 8938 79.2bc 588.1a 386.3a

CNAs 8960 89.2bc 478.3a 429.7a

CNAs 8989 91.2bc 635.1a 470.9a

CNAs 8824 68.2c 456.9a 417.4a

CNAs 8957 100.5abc 481.1a 465.5a

CRO 97422 109.1abc 491.1a 387.3a

CNAs 8817 84.9bc 581.9a 444.0a

CNAs 8934 142.3a 620.2a 370.5a

CNAs 9852 100.7abc 473.9a 385.3a

CNAs 8950 115.4abc 434.6a 422.0a

CNA 8540 72.1c 578.0a 405.3a

CNA 8711 111.8abc 541.8a 414.9a

CNA 8170 99.0abc 654.3a 298.1a

BRS Primavera 87.1bc 352.2a 484.8a

BRS Canastra 123.3abc 382.1a 381.5a

BRS Carisma 94.4abc 552.4a 439.4a

Average 98.9 511.2 422.9

F-test
N level (N)

** NS

Genotype (G) ** NS

** NS

N × G

CV (%) 21 25

Source: Adapted from Fageria, N. K., O. P. Morais, and A. B. Santos. 2010a. J. Plant Nutr. 33:1696-1711.
**, NS: Significant at the 1% probability level and nonsignificant, respectively. Means followed by the same letter in the same
column are not significantly different at the 5% probability level by Tukey's test.

accumulation in the shoot as well as the grain can improve upland rice yield. However, the influence
of N accumulation in the grain is higher compared to that in the shoot.
The author also studied N uptake in the shoots and grains of dry bean genotypes (Table 3.9).
Nitrogen uptake in the shoot varied from 121.5 to 296.6 mg pot -1 across two N rates with an average
value of 195.3 mg pot -1 . Similarly, N uptake in the grain varied from 267 to 838.3 mg pot -1 , with
an average value of 613 mg N pot -1 . The N uptake in the shoot and grain varied according to the
variation in the shoot and grain yield among different genotypes. The N uptake in the grain was
214% higher compared with the N uptake in the shoot. The higher N uptake in the grain is related
to a higher grain yield and higher N concentration in the grain compared to the shoot yield and N
concentration in the shoot. A higher uptake of N in the bean grain compared to the shoot has been
reported by Fageria (1989a). Nitrogen uptake in the shoot was having a significant quadratic associa-
tion with the grain yield (Y = 3.4063 + 0.0613X - 0.000026X 2 , R 2 = 0.4153*). Similarly, N uptake
in the grain was having a significant linear association with grain yield (Y = 0.4282 + 0.0216X,
R 2 = 0.9101*). This means that the variation in grain yield was higher due to N accumulation in the
grain compared to N accumulation in the shoot.