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Post by Freeborn on Apr 27, 2017 7:35:08 GMT -6
Can you guys provide your recommendations on my soil test and what to add? My soils are very sandy and I am thinking in the long run I may go no-till.
I have a 6 acre primary food-plot that is half good soil and half bad soil. I took 12 core samples and 2/3 of them were in the worst soil areas.
Thanks,
FB
Sorry but I can't seem to post a PDF as an open file.
FB Farm Soil Sample 4-2017.pdf (138.79 KB)
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Post by Freeborn on Apr 27, 2017 8:10:28 GMT -6
I should add that my samples specifies Corn as the crop choice but I plant 1/2 soybeans and 1/2 corn and rotate them.
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Post by biglakebass on Apr 27, 2017 8:14:28 GMT -6
Beans take far different fertilizers than corn though.
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Post by Freeborn on Apr 27, 2017 8:17:39 GMT -6
Beans take far different fertilizers than corn though. LOL
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Post by biglakebass on Apr 27, 2017 8:19:52 GMT -6
What did I say?
I was simply stating if you put corn as your crop of choice on the soil sample, but you plan to do half beans. Your fertilzer type the soil test says to add isnt for beans.
PS - I havent looked at the soil sample you posted yet.
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Post by Freeborn on Apr 27, 2017 8:59:29 GMT -6
No worries BLB, it’s all good.
For the group, If you look towards the bottom of the results it indicates Crop Removal P205=68 and K20=46, is this the reduction of these minerals if I remove the crop? If it is I would assume having the deer eat the crop (rather than harvesting) provides the same results.
I’m also interested in recommendations on Micro-nutrients.
Thanks,
FB
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Post by wildfire123 on Apr 27, 2017 9:15:49 GMT -6
Use a corn starter with micronutrients . For the beans, potash and phosphorus. Contacted CPS Big Lake 300 to 400 lbs per acre for corn.
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Post by Freeborn on Apr 27, 2017 9:28:41 GMT -6
Use a corn starter with micronutrients . For the beans, potash and phosphorus. Contacted CPS Big Lake 300 to 400 lbs per acre for corn. Thanks, If you use a starter fertilizer when do you broadcast your primary fertilizer? CPS Big Lake must be your coop? I will use Pro-Ag in Parkers Prairie for this material.
I like the idea of a split application for fertilizer but am always a little Leary of a second application because you don’t incorporate it into the ground. As a remote owner waiting on rain in OTC can be a losing proposition.
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Post by sd51555 on Apr 27, 2017 9:37:51 GMT -6
Do your plots get wiped out each year? Also, what kind of fertilizer do u have access to?
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Post by sd51555 on Apr 27, 2017 9:42:30 GMT -6
First thing that jumps out at me is, you can't hold even half the nitrogen they're recommending if looking at one application.
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Post by Freeborn on Apr 27, 2017 9:47:00 GMT -6
First thing that jumps out at me is, you can't hold even half the nitrogen they're recommending if looking at one application. Yep,
My plots are gone by December/January. I'm in Ag country so I should have access to most everything. I have used Urea but am open to other ideas. I have used Urea with the inhibitor in the past as a one time application.
How do you know I can't hold the nitrogen? Poor OM and Soil type?
I have used split applications in the past with good results but I have broadcast it manually so its allot of work. I typically don't like driving over my plots so I have done it by hand.
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Post by Freeborn on Apr 27, 2017 10:14:56 GMT -6
I found this on the AGVISE Website, answers my question but it looks like my best approach is to have multiple applications.
An idea being promoted at some farmer meetings is that a soil can hold 10 lbs of nitrogen for each millequivalent (meq) of CEC. Lets put this idea in the category of urban legend. This legend would have you believe that a sandy soil with a CEC of 11 would safely hold 110 lb/a nitrogen on the cation exchange sites. The truth is that all the ammonium from many common fertilizers will be held on the soil cation exchange site for a short time, until it converts to the nitrate form (This conversion can happen as fast as 5 days). The ammonium ion (NH4+) has a positive charge allowing the soil, which has a negative charge, to hold the ammonium until it is converted to the nitrate form. Guess what? When nitrogen fertilizer has converted to nitrate form, a soil does not “hold” any nitrogen because they both have a negative charge. The nitrate anion is free to move with water in the soil profile. Where the water goes, the nitrogen will follow.
That said, soil CEC can provide a good estimate of soil texture. (See table below). A low CEC soil indicates the soil has a sandy texture while a high CEC indicates the soil has a high clay content and is likely fine textured.
The soil texture determines the amount of water held by a soil and how fast it moves through the soil profile. So 2 inches of rain on a low CEC soil (CEC <10) will leach nitrate nitrogen deeper in the profile than a soil with a high CEC soil with lots of clay.
A sandy soil that has a CEC of 7 meq will not hold 70 lbs of nitrogen. A few inches of rain will move the nitrogen deep into the profile as illustrated in the table. If you apply 100 lbs of nitrogen to a soil with a CEC of 7, 70 lbs will not stay attached to the soil while the other 30 lbs will leach. Once the N has converted to nitrate, all 100 lbs of nitrogen will move down in the profile. So this urban legend is busted. When making decisions on how much N can safely be applied to a soil, you need to consider soil texture (CEC), drainage (well or poorly drained) if the field is subject to flooding, time of year for application, type of placement (band vs broadcast), etc. There is no easy rule that will work in all situations
For many years, AGVISE staff of experienced Agronomists and Soil Scientists have suggested growers should split apply spring nitrogen to light textured fields with low CEC (<10) because the risk for leaching nitrogen is high. In summary, the CEC provides useful information on soil texture and water movement in the soil. 1. CEC will not tell you how much nitrogen the soil will “hold.” Ammonium based fertilizers convert quickly to nitrate N in the soil and the nitrate anion is negatively charged and will not be held on the soil which also has a negative charge. 2. The CEC will provide a good estimate of the soil texture. 3. The CEC can aid in decisions regarding the need for split applications or side-dressing crops like corn. 4. The next time somebody tells you there is magical formula that calculates the rate of nitrogen fertilizer that can safely be “held” on a low CEC sandy soil, ask him how much of his money he is willing to give you if the N is lost to leaching?
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Post by biglakebass on Apr 27, 2017 10:17:44 GMT -6
Never ceases to amaze me how much science is behind farming.
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Post by sd51555 on Apr 27, 2017 10:51:49 GMT -6
I would use AMS for your N on the corn. A proper amount of sulfur can bring up your corn yield when u can't push N real hard. Plus, AMS is a little more stable form of N vs Urea.
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Post by biglakebass on Apr 27, 2017 10:56:50 GMT -6
AMS?
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