Dorivar Ruiz Diaz – Soybean Nutrient Management

(Conrad) Good morning and welcome to Farm Factor on AGam in Kansas. I’m your host Conrad Kabus. A series of soybean schools were offered in February of 2015 to provide in depth training targeted for Kansas soybean producers from Kansas State and other professionals giving workshops. It was sponsored primarily by the Kansas Soybean Commission and several entities with an interest in the soybean industry. There were also workshops on soil fertility and nutrient management. (Dorivar) Soybean school today, the topic that we covered was focusing on nutrient management, basically nutrient aspect of soybean production. And I feel the things that we’ve been hearing more questions from producers related to the grain price and the cost of fertilizer and whether we need to be evaluating some of the fertility program. I think that’s one of the main concerns this year. So we focused quite a bit on again the value of soil testing, in particular which showed to be ultimately one of the main ways to try to be more efficient in nutrient management in general, especially for the main nutrients. (Conrad) Kansas has the opportunity to have the biggest return in dollars from the fertilizer and micronutrient use. There are many long term tests that farmers need to know about their fertilizers. (Dorivar) One of the things we talk about today relates quite a bit again on on terms of using the long term history information basically for soil tests especially for phosphorus, and how that information can help us to basically fine tune or adjust our fertility management for soybeans. One thing that is important to keep in mind for soybeans is that crop can take out significant amounts of nutrients per bushel of grain. So giving a good yield environment we can remove significant amounts of nutrients. Another aspect that also that we discuss quite a bit today focuses on basically the timing of fertilizer applications for corn, especially in a corn/soybean type rotation. It’s not uncommon for producers to put fertilizer before the corn and intend it basically for the two crops. One of the concerns that I have sometimes is that soybeans may be short of fertilizer in that kind of situations. And it’s something that we always need to emphasize that if we are choosing to do a fertilizer application every couple years, we need to make sure and the requirements of soybeans is cover and when we are thinking about application rates. Another study that… another aspect that we cover today also focused on some studies that we’ve been doing especially micro nutrient management. (Conrad) It’s also important to remember that micro nutrients affect crops and soil health as well, from sulfur to zinc. It’s important to consider these critical pieces when producing soybean crops. (Dorivar) Another topic that we covered today focused on, one of the studies that we’ve been doing the last couple years, supported by the Soybean Commission, focusing on secondary micro nutrient management for different soil types and different yield environments for soybeans. So we finished with that study and we were looking at some of the data and basically the take home message from that study is that the potential response to some of those nutrients usually goes back to soil conditions, especially soil types in terms of texture, organic matter content, CEC, which seems to be again and pH in particular also
in some environments which tends to be the key factors in determining whether we’ll see a response to those nutrients.

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