Hi Juan
 
APSIM model does a good job for intercropping systems. Here we are using
quite  some for simulating soybean/pigeonpea intercropping systems.
 
K.Srinivas

-----Original Message-----
From: JUAN PABLO MONZON [mailto:[log in to unmask]]
Sent: 09 June 2004 04:44
To: [log in to unmask]
Subject: Re: Modelling intercrops



Ken

Thanks for your answer. I am reading a paper of M. Kropff. (Agri. Syst. 73:
173-203). I also have problems when I was trying to simulate wheat, when I
change the row distance from 18cm to 36cm the yield does not change, even if
I change it to 100cm. 

Juan Pablo Monzon



>From: ken boote <[log in to unmask]> 
>Reply-To: DSSAT - Crop Models and Applications <[log in to unmask]> 
>To: [log in to unmask] 
>Subject: Re: Modelling intercrops 
>Date: Tue, 8 Jun 2004 08:57:13 -0400 
> 
>Juan, 
> 
>The present DSSAT models do not simulate intercrops or differential 
>height 
>competition for light interception (dry matter accumulation) 
>purposes.  So, 
>you can not do it in the DSSAT models. 
> 
>To do this correctly, you would need to predict the height of each 
>crop and 
>the corresponding (and competing) vertical LAI distribution of each 
>component.  I recommend that you see the approach followed in the 
>INTERCOM 
>model of Martin Kropff, Wageningen Agricultural University, The 
>Netherlands.  His model predicts those aspects of species 
>competition 
>nicely, but probably does not go to final yield like you would 
>like.  Martin Kropff did write one of those Wageningen special 
>publications 
>on the topic.  Either Pudoc Publications (Wageningen in-house) or 
>Halstead 
>Press. 
> 
>Can anyone give us the full citation of Kropff's book and where to 
>order? 
> 
>Ken Boote 
> 
> 
>At 11:37 PM 6/7/04 -0700, you wrote: 
>>  My name is Juan and I am trying to simulate the performances of a 
>>wheat/soybean intercrop.  The design of the intercrop (or relay 
>>intercrop) is 3:1 and has a distance of 75cm, I have 3 rows of 
>>wheat to 
>>17,5cm of distance and 1 row of soy to 17,5cm of distance from the 
>>rows 
>>of wheat and again the same design.  The soy is sown 30 days before 
>>the 
>>harvest of the wheat.  Because of the design, the wheat fails to 
>>capture 
>>the totality of the radiation and the soy grows inside the wheat 
>>during 
>>25-30 days until the wheat harvest and during this period the 
>>soy receives less radiation than the one that would receive it if 
>>sown alone. 
>>Any idea for this simulation is welcome. 
>>Greetings Juan Pablo Monzon 

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