Soybean Fertility Basics;
Casey Fertilizer Company, Inc.
By John Crouch, Certified Crop Adviser
Soybean facts;
- If all inputs are adequate, planting date and row spacing determine 50% of yield
- University studies show 15" rows are best yielders on average
- Disease control accounts for 15% of yield
- Weed control accounts for 15% of yield
- Weekly scouting essential for insects, disease, and weeds reduces risk of problem. Producers willing to settle for 95% weed control have, on average, larger profits
than those who respray multiple times to achieve 100% control.
Removal rates;
Fertility; the simple method at figuring removal.
- P removal = .46 lbs per bushel produced
- K removal – 1.32 lbs per bushel produced
Soybean nutrient requirements using CEC as benchmark, Casey Fertilizer Soil Fertility program;
CEC [0-5] = ((30-P) X 9)/2 + (yield X .46)
CEC [5-10] = ((40-P) X 9)/2 + (yield X .46)
CEC [>10] = ((50-P) X 9)/2 + (yield X .46)
CEC [0-5] = ((200-K) X 4)/2 + (yield X 1.32)
CEC [5-10] = ((230-K) X 4)/2 + (yield X 1.32)
CEC [>10] = ((280-K) X 4)/2 + (yield X 1.32) pH requirements;
Optimum pH for soybeans is 6.8 to 7.0. Pelletized lime helps to escalate a slightly reduced number to produce optimum yields. Following is an easy to use guide to determine if, or how much, you need.
pH [<5.9] = use ag lime
pH [5.9-6.1] = use 200 lbs of pel-lime
pH [6.1-6.3] = use 150 lbs of pel-lime
pH [6.3-6.5] = use 100 lbs of pel-lime
pH [6.5-6.7] = use 50 lbs of pel-lime
pH [> 6.7] = no lime application necessary
pH [<7.1] = no sulfer application necessary, unless otherwise noted by soil test
pH [>7.1] = apply 20 lbs sulfer with fertilizer application For more information click on the following;
www.fertilie-minds.org www.back-to-basics.net www.minproccompanies.com |
