Table 2: Field trial using slow-release fertilizers on rice and potatoes: yields, nutrient uptake, and vitamin C.

Treatments Rice at Baruipur (new alluvium) 
Rice at Nalikul (old alluvium)  
Potato at Nalikul (old alluvium)  
Yield (kg/ha) Total uptake (g/ha) Yield (kg/ha) Total uptake (g/ha) Yield (kg/ha)Total uptake (g/ha)Vitamin C (mg/100 g)
ZnFeMnCuZnFeMnCuZnFeMnCu

C 324270.6 24614021369876 49220641990021776469916.21
S1307670.6 35015822372480 4992164210700239948107974.53
S2359675.6 30316226396178 59323647950021691593975.33
S3374885.7 341179233831875772294411000277756851035.94
P14647b,d105.1b,d472a,c236b,d334056117b,d597332b,d7014075a432a,c1966a151a1638.44a,d
P24998b,d120.8b,d615b,d288b,d334397b,c122b,d876b,c351b,d7612550 39617561401486.31
P34383b110.6b,c492a229b344462b,d114b,c693291b,c4816025b,d560b,d2569b,d225b,d198a,c8.11c

CD (5%)758.322.4 215559373.2208 241.65963460.083.9479.533.333.12.07

CD (1%)1021.229.8 286.574.4502.6281325.380.24687.5113645.644.944.62.81

C: Control; S1–S3: sulfates of Zn, Fe, Mn, and Cu; P1–P3: slow-release micronutrients; S1 and P1: 1 kg/ha Zn + 0.33 kg/ha Fe + 0.165 kg/ha Mn + 0.083 kg/ha Cu; S2 and P2: 2 kg/ha Zn + 0.66 kg/ha Fe + 0.33 kg/ha Mn + 0.165 kg/ha Cu; S3 and P3: 4 kg/ha Zn + 1.33 kg/ha Fe + 0.66 kg/ha Mn + 0.33 kg/ha Cu. aSignificant with respect to control at 5% level. bSignificant with respect to control at 1% level. cSignificant with respect to the corresponding water-soluble treatment at 5% level. dSignificant with respect to the corresponding water-soluble treatment at 1% level.