i have reciently purchased a strip till machine this fall and used it to run down bout 200 lbs of p and k on my corn ground for 2013. right now though trying figure out the best solution for getting my nitrogen out there this comming spring. typically in the past we would broadcast and work in about 200 to 250 lbs of urea, 50 lbs of k and 150 lbs of dap. we also put down about 8 to 10 gal of 6-24-6 of popup with the planter.
the option i think we are going to go with as of right now is just side dress NH3 out there when the corn is up, but also flirting with the idea of banding urea down with the planter. or open to more ideas
I would think the corn would need some N before the NH3 could be applied or used... is that 200 lbs of actual or product of p and k?? I am letting the coop do a bunch of the leg work this year for me. They are putting out 100lbs of dry N with stabilizer, 55lbs of actual phos, and 20lbs of actual elemental sulpher. All that pre-plant. Im putting on 5 gallon of 10-34-0 in furrow, and another 3 gallon of 10-34-0 with 32 two inches to the side and down from the seed with the planter.
the old school guys around here applied NH3 in the fall... i pry wouldnt recommend that though.
we put out 150lbs of DAP(18-46-0) and 50lbs of potash(0-0-60) so looking at a profile of 27-69-30 per an acre. we will run 8 gal +/- of 6-24-6 down in the seed trench, and considering either putting some 28% down with the planter as well. not really sure exactly were i should be placing the 28% (stick with the 2" aside and 2" down rule, or place it mid row?) and how much i dare put on. but then following up later with sidedressing the rest of the nitrogen on (looking more at using 28% now rather than nh3). look like i can add coulters to an old 3pt band sprayer i have for about $450.00 a unit to side dress liquid with. but the biggest question on my mind at the moment is the rates to use with liquid. if i want to match the same profile as i historically used in the past, that would mean i need to put out about a total of 38 gal per an acre of 28% to get to the same levels of N i was getting out there broadcasting.
I would recommend putting it in the 2x2, then couldering the rest on. I would think the corn roots would take a while to get to the middle of the row. Broadcasting pre-emerage or pre-plant even works, but can lose some serious N to volitization, or leeching under the right conditions. Some guys around here put on up to 100lbs of actual N in the 2x2 and have no issues. Some guys just dribble 32% right on top of the ground. I have been known to side dress 56 gallon of 32% with a cultivator before... Wouldn't recommend that either, a guy could start to get 'hot spots' in the soil probably.
There is about 42 different ways to apply N. Most of them work just fine. My 2 cent recap would be get it buried, and spread out the applications as much as you can.
thanks for the input...
Im not too familiar with the exact soil properties your way, but i will tell ya what we have had the most success with on corn in our midwest region plots. Our CEC isn't spectacular( only about 20 meq/100g), so we have to keep an eye out on that K all year with plant tissues. Also, we have put our focus on availability over application rates by adding a more life to the topsoil. Our total application is about 95 lbs N, 30 lbs P205, and 54 lbs K20 for plant food and 1 to 1.5 gal microbial formulations for soil food. For a regular ol 150 bu./ac yield goal, we will hit it with a simple 1/3 application of N plant food starter (urea) , full application of P & K and 1/2 application of soil food starter. We will wait on the first plant tissue to make sure any adjustments are precise and then go ahead and finish the other 2/3 of N plant food(28% solution) and 1/2 soil food as a side dress.
My input would just be to focus on the life in the soil, so it can turn over everything you put down and build up the OM. I'm not a hippie type of guy, it just honestly saves a lot of costs in the long haul.
As for the rates on that 28% , maybe you could get enough down at starter to give time for a plant tissue to show ya how much is going to the plant each day? That'll key ya in on how much or how little you can get away with applying for side dress to push it on through to harvest.
We are 100% no-till and getting the N on is a regular question. We are in SW Ohio and are generally planting in warm soils so P and K activity is not as big an issue as in the cold planting regions. We put 10 gallons of 28% 2*2 on the planter. This makes a huge diffence in getting the plant off to a good start. We then come back and sidedress 35-40 gallons of 28% when the corn is 4-6 inches tall. We are down to less than 1 unit on N per unit of targeted yield. The 28% is a nive mixture of N forms. The cost of the product per unit of actual N and the accuracy of the application makes this very cost efficient and environmentally friendly. The major draw back is the delay on the planter from handling the fert and my fear of a muddy late spring that makes sidedressing difficult.
We started strip-tilling 2 years ago. We are still trying to figure the N thing out and I think we will eventually move to using 28% in split applications. However where you are now(2013) is similar to where we were last year. We had put 66 units of N in the strip along with the P and K, some stripped in fall and some stripped in spring. We then broadcast urea on top before rains. This made for tight application windows but we got lucky last year. Some fields we did a secound application. It appears that paid. However we had some extreme winds last summer and most of our corn went down so it made it harder to track what paid at harvest. We track our plant needs through tissue samples in order to make adjustments for the next year. It appears we had enough N last year. We were extremely happy with the results(180-220). We got lucky on the weather. I would be interested to hear how the stip-tilling ends up working for you. We don't have anyone else in our area doing it and are learning alot of stuff the hard way. Before strip-tilling we were no-till for a number of years, we liked that but we struggled to figure out a fertilizer system and our ground is cold in the spring. These are the 2 reasons we switched to stip-till. How deep did you place your P and K last fall?
we placed the p and k about 7" in down in the strip.