Available nitrogen of less than 280 kg/hectare is considered:
A.Low
B.Medium
C.High
D.Trace
A.Low
B.Medium
C.High
D.Trace
A.Saline soil
B.Alkaline soil
C.Saline alkaline soil
D.All of the above
A.K2O, P2O5 and Lime
B.N
C.Fe, A1
D.Si, Cu
A.Soil horizons
B.Solum
C.Profile
D.None of the above
A.CaCO3
B.H2SO4
C.Ca SO4.2H2O
D.HNO3
A.Upland rice
B.Jute
C.Lowland rice
D.Sorghum
A.Vegetaion and topography
B.Time, topography and climate
C.Time and vegetation
D.Vegetation and climate
A.Relative thickness or whiteness
B.Purity of the colour
C.Dominant spectral or rainbow
D.All of the above