Bahan Kajian MK. Manajemen Kesuburan Tanah. MANAJEMEN NITROGEN TANAMAN JAGUNG. Smno.agroekotek.fpub.sept2013. Tanaman jagung memerlukan sejumlah besar nitrogen.
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BahanKajian MK. ManajemenKesuburan Tanah
Proper nitrogen fertilizer application Good nitrogen management is essential for protecting groundwater quality. Proper nitrogen management includes managing nitrogen rate, source, timing, and placement. The primary goal of nitrogen best management practices is attaining high nitrogen use efficiency.
This assures the most effective use of nitrogen fertilizer.
The sufficiency range is the nutrient level at which the plant has enough nutrients to function and develop properly, but not so much that it is poisoned. This is reported as "medium" or "high" on soil tests.
Oran00 Rep1 Block6
Yield (Mg ha-1)
N rate (kg ha-1)
Oran00 Rep3 Block26
Yield (Mg ha-1)
N rate (kg ha-1)
Research supported in part by the USDA- NRI, IFAFS, and CIG Grant Programs. Assistance also given by OSU, NTech, and Holland Scientific Instruments.
N Recommendation for corn Grant Programs. Assistance also given by OSU,
Cornell Corn N Recommendations Grant Programs. Assistance also given by OSU,
in lbs N/acre
(yield potential * 1.2) – soil N – sod N
N requirement =
in lbs N/acre
- soybean N or manure N credits
= soil series specific
Initial Grant Programs. Assistance also given by OSU, Field Calibration
Loss-on-ignition (g kg-1)
Established Gliricidia-maize intercropping system in Southern Malawi. Photo: T. Breedy
Effect of CROPPING SYSTEM on drainage volume, NO Grant Programs. Assistance also given by OSU, 3-N concentration, and N loss in subsurface tile drainage during a 4-yr period (1990-93) in MN.
Cumulative Nitrogen Uptake Across the Growing mineralization.Season
Cropping system has greater effect on hydrology and nitrate losses than any other management factor!
Good nitrogen management requires understanding:
How nitrogen is used by the crop
When nitrogen is used by the crop
What environmental influences affect the use of soil and fertilizer nitrogen by the growing crop
How management of nitrogen and irrigation water affect the leaching of residual nitrate, which eventually affects water quality
Effect of N rate on yield of corn after soybean, net return to fertilizer N, and nitrate-N concentration in tile drainage at Waseca (2000–2003).
Effect of N rate applied for corn in 2003 on nitrate-N concentration and loss in tile drainage during May–September 2004 from soybeans at Waseca.
Maximum nitrogen uptake occurs in periods of maximum growth (in corn roughly between vegetative growth stages V9 and V18, or from hip-high to just before tasseling).
Risk of N loss is low during this period.
Credit: Iowa State University Extension.
(low – medium – high – very high)
N rate (lb/acre)
Critical value or range indicates the soil or tissue content below which the plant most likely is deficient in that specific nutrient and production could be enhanced by addition of the nutrient. Below that critical value, the nutrient levels are below optimum.
Luxury consumption occurs when soil nutrient levels are above optimum and plants take up more of a nutrient than needed for functioning and production. Potassium (K) is commonly taken up in excess.
Corn following Corn
Heavy clay soils above optimum and plants take up more of a nutrient than needed for functioning and production. Potassium (K) is commonly taken up in excess.
118 bu. average
Corn price $3.12
N price (28%) $385/T
Previous crop - soybeans
N:Corn Ratio = .22
Crop condition – excellent
Soil Moisture – excellent
Recommendation: 80 Lbs. added N/a range 65 – 95 lbs/aExample # 1
Sandy loam soils above optimum and plants take up more of a nutrient than needed for functioning and production. Potassium (K) is commonly taken up in excess.
167 bu. average
Corn price $4.04
N price (28%) $365/T
Previous crop soybeans
N:Corn Ratio = .16
Crop conditions – excellent
Population – 32,000
Soil moisture – very good
Recommendations: 105 lbs. added N range of 90 -120 lbs/aExample # 2
0 40 80 120 160 above optimum and plants take up more of a nutrient than needed for functioning and production. Potassium (K) is commonly taken up in excess.
Lbs. of sidedress N applied
Previous Crop – Soybeans ~ 30 lb credit