Warning

1. The N leaching algorithms will not work satisfactory if there are coarse continuous pores in the soil as occurs when it is strongly structured.

2. The P routines can only work when available P is by the Olsen (1954) method (i.e. extraction with 0.5M NaHCO3 pH 7.8).

3. P and K routines require coefficients for the interchange between the various forms in which K and P exist in soil. If they are not available, then suggest use the default values.

4. Crop responses to N, P and K depend on a whole range of different factors and our models can only take account of some them. There can therefore be large errors in using the models, and this should be born in mind when interpreting any predictions from them.



Crop data

Please enter crop data in the section.

Crop:
Date of planting
Date of harvest
Date when simulation ceases
Max dry weight of total plant at harvest (t/ha) (0.01 ~ 25)
Barrier to rooting depth (cm) (1 ~ 200)



Soil data

Please enter soil data in the section.

Soil Type
Clay content (%) (10 ~ 50)
Soil bulk density (g/cm3) (0.9 ~ 1.9)
Field capacity in 0-30cm soil layer (cm3/cm3) (0.15 ~ 0.5)
Field capacity in 30-60cm soil layer (cm3/cm3) (0.15 ~ 0.5)
Field capacity in 60-90cm soil layer (cm3/cm3) (0.15 ~ 0.5)
Date when soil moisture deficit known (MUST be earlier than any other input dates)
Soil moisture deficit (mm) (0 ~ 200)





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Please email us for more questions about the model. kefeng.zhang@warwick.ac.uk or d.greenwood@warwick.ac.uk