Sir I am Mr.Harikrishna B.L. Ph.D. Scholar in the Dept. of Soil Science & Agril. Chemistry at UAS-Dharwad,  Karnataka. Sir I am working on maize crop simulation modeling.

1.      My research title is “studies on effect of soil depths, nitrogen doses and their splits on growth and yield of maize crop using CERES maize model”. I have taken two season maize crop and collected detailed information about soil profiles (shallow depth-44cm, medium depth-75cm and deep black-150cm), maximum & minimum temperature, sunshine hours, maxi. number of kernels per/cob, average grain filling rate (mg/day), flowering date for the calculation of  genetic-coefficients (G.C) for my crops. Sir one of the parameter required for G.C is P2 parameter (Extent to which development (expressed in days) is delayed for each hour increase in photoperiod above the longest photoperiod at which development proceeds at a maximum rate (which is considered as 12.5 hr.) sir I don’t know how to calculate this parameter. Sir I am sending weather data of my expt., if time permits please calculate the G.C for my crop including P2 parameter, otherwise send me the stepwise detailed procedure about how to calculate this G.C.
2.      Sir I have used shallow soil profile (44cm deep) in that I got 5603 kg grains/ha measured yield but when I simulated using the same treatment ,the predicted grain yield was 4600 kg/ha,and lower no. of kernels per cob, even I calibrated the genetic coefficent parameters under sensitivity analysis , please suggest me that how to over come this problem or send me the correct information regarding this problem.


Measured data of my crop are as follows
Crop: maize
Flowering date: 58 days
Maxi. Kernels: 725/ cob
Grain filling rate: 6.7 mg/day
Sun shine hour: below 11hr. /day during entire cropping period.



Thanking you
Harikrishna