Apsim 7.10 Yield problem of 1:1 combined application of organic and inorganic fertilizers

[fdewg]

The yield of Apsim organic fertilizer (c/n=8, c/p=50) fertilizer (urea) 1:1 combined with different nitrogen application amounts (in terms of pure nitrogen) was lower than that of chemical fertilizer alone. This is contrary to the results of field experiments in which the yield of organic and inorganic combined application is higher than that of single application？What is the reason for this?

[peter-devoil]

All the components of fertiliser are "translated" into no3, nh4 and urea by the fertiliser module, and added to soil N pools

Many apsim crops can't utilise nh4 & urea until it is transformed to NO3; the process of which is influenced by water and temperature. Details are here

[fdewg]

肥料的所有成分都被肥料模块“转化”成no3、nh4和尿素，并添加到土壤氮库中

许多APSIM作物在转化为NO4之前不能利用NH3和尿素;其过程受水和温度的影响。详情请见此处

Does water and temperature in APSIM affect the decomposition rate of organic matter?
Then what moisture and temperature Settings will make the yield of organic and inorganic combined fertilizer significantly higher than that of single fertilizer, so as to conform to production practice?

[peter-devoil]

Water & temperature are dynamic - changing the state of the system every day

You'll require sensible parameterisation of your water balance, and accurate climate data.

[fdewg]

水和温度是动态的 - 每天改变系统的状态

您需要对水平衡进行合理的参数化，并获得准确的气候数据。

Thank you very much！

[BrianCollinss]

Can you tell us about irrigation regime?

[fdewg]

No irrigation, no farming