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Mike Stewart      
Southern and Central Great Plains Director

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Regional Update - Fall 2011
It has been a pretty bleak season for the lower half to two-thirds of the region. Texas, Oklahoma, New Mexico, and some of Colorado have been in very serious drought conditions. Almost the entire state of Texas has been in the highest category of drought rating (exceptional), and it has resulted in record financial losses for that state’s agriculture. The latest crop condition report for Texas showed that 90% of corn and 88% of cotton was rated in the very poor to fair range. Oklahoma was not faring much better with 87% of corn and 98% of cotton in the same condition. Parts of Kansas are similarly affected, but the northern part of the state is in relatively good condition. The Kansas report shows 69% of corn, 73% of sorghum, and 70% of soybean in the fair to very poor condition range. Nebraska crop conditions are overall much better than those of the states to the south.

The extreme drought conditions have clearly had a dramatic impact on crop production in the majority of the region. Where yields have been reduced or crops have failed, some fertilizer applied in 2011 may be carried over into 2012. On the other hand, some corn and sorghum that was initially planted for grain was harvested for silage or baled in anticipation of grain crop failure and in need of animal feed. The drought in this case may result in more removal than expected and therefore a need for greater fertilizer inputs going into next year. In planning for the coming season it will be important to make these types of nutrient balance (export from fields compared to input) considerations and to soil test. Soil testing for nitrate-N (2 ft. sample depth) is another practice that may be advisable, particularly on the High Plains, as there will likely be some residual or carryover N going into the next season.


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Approaches for Recommending P and K Fertilizer

After soil samples have been obtained and analyzed, the laboratory or consultant must somehow arrive at fertilizer recommendations for a crop. Part of the challenge is that there’s more than one way to recommend fertilization.

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Maximizing Irrigated Soybean Yields in the Great Plains

Several years of irrigated field research in north central Kansas clearly demonstrated the importance of complete and balanced nutrition in the production of high yield corn (Gordon, 2005). However, fertilization of soybeans in a common corn/soybean rotation has traditionally been secondary to corn fertilization, as the crop is usually left to scavenge nutrients remaining after corn. This study was started in 2004 as an expansion of the original corn research to determine the benefit of direct fertilizer application to sprinkler irrigated soybeans. It has shown that the addition of P and K can have a significant impact on soybean yield, with 4-year average increases due to P and K as high as 34 bu/A. This experiment also demonstrated that Mn can impact soybean production in high yielding environments.

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Maximizing Irrigated Corn Yields in the Great Plains

There is a large gap between attainable corn yields and present average yields. The overall objective of this north central Kansas work is to find practical ways of narrowing this gap. Two plant populations and two nutrient input levels were evaluated. With low fertility inputs, yields were decreased when population increased. However, corn produced significantly greater yield at the higher population with additional fertility inputs. One-third of the response to additional nutrient inputs was lost if plant density was not increased. This work further illustrates the importance of using a systems approach when attempting to increase yield levels.

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Potassium affects food quality

Potassium is important in optimizing both crop yield and economic quality. Root activity and K uptake are generally reduced during the reproductive phase of crop development. This article details a Rio Grande Valley study that has shown that supplementing soil K with additional foliar K applications during cantaloupe fruit development and maturation improves fruit marketable quality by increasing firmness and sugar content, and fruit human health quality by increasing ascorbic acid, beta-carotene, and K levels.

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CO-09F: Dwayne Westfall

Phosphorus Soil Test Calibration Using Landscape Spatial Variability

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CO-13: Jessica Davis

Contribution of Animal Feeding Operations and Synthetic Fertilizers to Ammonia Deposition in Rocky Mountain National Park

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CO-12F: Raj Khosla

Spatial Removal of Nutrients by Corn

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CO-11F: Dwayne Westfall

Long-term Phosphorus Fertilization of No-till Dryland Intensive Cropping Systems

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CO-10F: Jessica Davis

Potassium Needs of High-yielding Alfalfa on the West Slope of Colorado

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Cotton Nutrition and Fertilization

2011 Spring

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Quality Alfalfa Requires Good Fertility

2011 Summer

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Silage Production and Fertilization

2010-2011 Winter

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