The web address will continue in use for a transitional period for communications sent or received on behalf of DuPont Performance Coatings., which is not affiliated in any way with the DuPont Company. If you no longer wish to receive marketing communications by email from DuPont Pioneer, please send an email message to to unsubscribe from our email distribution system. The sender is an individual contractor, not an employee of DuPont Pioneer and its affiliates. Wheat yields increased in 53 of the 1414 counties, but the remaining counties.
This e-mail does not constitute a consent to the use of sender's contact information for direct marketing purposes or for transfers of data to third parties. Combined with the Agricultural Production Systems Simulator (APSIM) wheat model, we assessed the winter wheat yield gaps and patterns in 1414 counties and at five physiogeographic regional scales across China to ascertain the driving factors of yield variations. Unless explicitly and conspicuously designated as "E-Contract Intended", this e-mail does not constitute a contract offer, a contract amendment, or an acceptance of a contract offer. Please notify the sender by return e-mail and delete this e-mail from your system. If you are not the intended recipient, you are hereby formally notified that any use, copying or distribution of this e-mail, in whole or in part, is strictly prohibited. There is also need to consider a balance between sustaining wheat yield and providing feed for livestock when developing management strategies for timing of lucerne removal and cropping option in lucerne-based rotation systems.This communication is for use by the intended recipient and contains information that may be Privileged, confidential or copyrighted under applicable law. The findings from these long-term simulations suggest there is need to develop management strategies when lucerne is integrated with annual cropping system to improve soil water use and reduce runoff. The simulation also indicated that integrating lucerne with annual cropping could potentially reduce runoff and early removal improved soil water storage prior to sowing winter wheat and optimise wheat yield following lucerne in a lucerne-wheat rotation system. The long-term simulation suggested that under local climatic conditions, lucerne could produce 11,000 kg/ha biomass annually. Using measurements of drained upper limit (DUL) and lower limit (LL), and standard soil evaporation and runoff parameters, the model was able to simulate soil water dynamics and water use by lucerne in the lucerne-fallow, continuous lucerne and lucerne-wheat treatments. Wheat grain yield was simulated with a RMSD of 918 kg/ha (27% of the mean observed grain yield).
In the treatment where lucerne was removed in August 2001 and two winter wheat crops were sown and harvested in 003 growing seasons, APSIM simulated winter wheat crop biomass in both growing seasons with a RMSD of 1420 kg/ha (20% of the mean observed crop biomass). After the APSIM-Lucerne module was configured for the seasonal variation in RUE (radiation use efficiency), the model simulated lucerne seasonal biomass production over three growing seasons in the continuous lucerne treatment with a root mean squared deviation (RMSD) of 1132 kg/ha (30% of the mean observed biomass). Flowering date was accurately simulated using the established relationship between accumulated thermal time and mean photoperiod.
With minimal parameterisation and configuration of the APSIM-Lucerne module, APSIM was able to simulate phenological development and seasonal growth of winter-dormant lucerne cultivar, Longdong compared with the observed data. The Agricultural Production System Simulator (APSIM) was parameterised and tested against datasets from two field experiments being conducted on Heilu soil at the Qingyang Research Station, Gansu, China as to investigate long-term lucerne productivity and management options of reducing impact of lucerne on winter wheat yield in a lucerne-wheat rotation system.