Jun 25, 2012 by Cindy Cox

A group of researchers from the University of Nebraska and Wageningen University are setting out to determine just that through the production of an atlas.

Feb 12, 2011 by Jawoo Koo

"How to compile and run DSSAT v4.5 on Linux?" Good question.

Question

Feb 4, 2011 by Jawoo Koo

Crop systems models can help researchers estimate the future of food security under climate scenarios. Many crop models are known to exist around the world - for different crops with varying complexities, yet it is not easy to find the right model for the right problem. To better understand the global extent of crop model development and to identify gaps in capabilities, HarvestChoice participated in an initiative to conduct a rapid meta-analysis of crop models using on-line survey to the crop modeling community in the world. Here are the key findings.

Word cloud of crops that respondents modeled

Aug 15, 2010 by Jawoo Koo

Conceptually, in its simplest form, one may liken the cultivation of a crop in the field to a mathematical function.

YIELD RESPONSES TO NITROGEN

Aug 12, 2010 by Jawoo Koo

As a quick demonstration to estimate crop yield levels at regional-scale with various management assumptions, this post describes how crop systems models can be used to assess yield gap of rainfed maize due to the limited supply of soil nitrogen. This methodology can help researchers to find what is the most critical factor that limits crop yield productivity in a given environment condition and how to address the constraint.

Aug 10, 2010 by Jawoo Koo

By modeling the decomposition of soil organic matter dynamics, crop systems models can simulate the effects of soil nutrient depletion under low-input extractive field management practices, as well as soil carbon sequestration under regenerative management practices.

Maize

Aug 5, 2010 by Jawoo Koo

Not only crop growth and yield, crop models can be also used to estimate potential damages from pest/disease through a predefined set of damage pathways, or coupling points.

Army worm damage on corn

Aug 4, 2010 by Jawoo Koo

Farming entails a great deal of choices and uncertainties. From season to season, weather varies, price fluctuates, soil degrades, pest damages, and climate changes. Farmers everywhere must cope with these uncertainties. Throughout the history of agriculture, many options have been developed to help manage these risks, increase yields, increase efficiency, and, more recently, promote the sustainability of the overall system.

Aug 2, 2010 by Jawoo Koo

Water availability is the most critical factor for sustaining crop productivity in rainfed agriculture. Even if a drought-tolerant trait is introduced, water isn't available to crops when there is no water in the soil. Rainfall variability from season to season greatly affects soil water availability to crops, and thus pose crop production risks.

HarvestChoice cofounders and principal investigators Stanley Wood and Philip Pardey discuss our mission, our data challenge, and four signature aspects of our innovative approach to more productive and profitable farming in Sub-Saharan Africa.