Search Results - "Blackmer, A.M"

Relationships between Soybean Yield, Soil pH, and Soil Carbonate Concentration by Rogovska, N.P, Blackmer, A.M, Mallarino, A.P

“…Soybean [Glycine max (L.) Merrill] often shows symptoms of iron deficiency chlorosis (IDC) on high pH, calcareous soils of the U.S. Midwest. The objective of…”
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Sensitivity of Chlorophyll Meters for Diagnosing Nitrogen Deficiencies of Corn in Production Agriculture by Zhang, J, Blackmer, A.M, Ellsworth, J.W, Koehler, K.J

“…Chlorophyll meters have been widely used to diagnose N deficiencies in research trials and to help refine N fertilizer recommendations in production…”
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Disaggregating Model Bias and Variability when Calculating Economic Optimum Rates of Nitrogen Fertilization for Corn by Kyveryga, P.M, Blackmer, A.M, Morris, T.F

“…Efforts to calculate economic optimum rates (EORs) of N fertilization for corn (Zea mays L.) have been hampered by a lack of methods for disaggregating…”
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Soil pH effects on nitrification of fall-applied anhydrous ammonia by Kyveryga, P.M, Blackmer, A.M, Ellsworth, J.W, Isla, R

“…Soil temperature at the time of application has been the primary factor used to predict rates of nitrification and assess the risks associated with losses of N…”
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Characterizing and Classifying Variability in Corn Yield Response to Nitrogen Fertilization on Subfield and Field Scales by Kyveryga, P.M, Blackmer, A.M, Zhang, J

“…Marked spatial and temporal variability in yield response to N fertilizer observed in individual yield response trials creates a high degree of uncertainty…”
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Diurnal variability in rate of emission of nitrous oxide from soils by Blackmer, A. M., Robbins, S. G., Bremner, J. M.

“…Diurnal variability in the rate of emission of nitrous oxide (N2O) from Iowa soils was studied by using a chamber technique to measure the N2O emission rates…”
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Alternative Benchmarks for Economically Optimal Rates of Nitrogen Fertilization for Corn by Kyveryga, P.M, Blackmer, A.M, Morris, T.F

“…Discussions of N fertilizer needs for corn (Zea mays L.) usually are based on the assumption that economic optimum rates (EORs) of N provide the best benchmark…”
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Differences in Physiological Age Affect Diagnosis of Nitrogen Deficiencies in Cornfields 1 1 Project supported by the Iowa Soybean Association, USA through the ISA On-Farm Network™ and Watershed Programming by ZHANG, J., BLACKMER, A.M., BLACKMER, T.M.

“…Many studies have shown that chlorophyll meter readings (CMRs) can be used to diagnose deficiencies of nitrogen (N) during the growth of corn ( Zea mays L.) in…”
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Soybean Yield and Soybean Cyst Nematode Densities Related to Soil pH, Soil Carbonate Concentrations, and Alkalinity Stress Index by Rogovska, N.P, Blackmer, A.M, Tylka, G.L

“…Soybean [Glycine max (L.) Merr.] grown on high pH, calcareous soils often suffer yield loss due to unavailability of Fe. Further yield decline can occur due to…”
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Luxury Production of Leaf Chlorophyll and Mid-Season Recovery from Nitrogen Deficiencies in Corn by Zhang, J, Blackmer, A.M, Ellsworth, J.W, Kyveryga, P.M, Blackmer, T.M

“…Deficiencies of N during the growth of corn (Zea mays L.) are often diagnosed by using chlorophyll meters that measure chlorophyll content in leaves. The…”
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Effects of drying and air-dry storage of soils on their capacity for denitrification of nitrate by Patten, D.K, Bremner, J.M, Blackmer, A.M

“…The effects of drying and air‐dry storage of soils on their capacity for denitrification of nitrate were studied by determining the influence of these…”
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Differences in Physiological Age Affect Diagnosis of Nitrogen Deficiencies in Cornfields by ZHANG, J., BLACKMER, A.M., BLACKMER, T.M.

“…Many studies have shown that chlorophyll meter readings （CMRs） can be used to diagnose deficiencies of nitrogen （N） during the growth of corn （Zea mays L.） in…”
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Temporal Patterns in Symptoms of Nitrogen Deficiency as Revealed by Remote Sensing of Corn Canopy by ZHANG, J., BLACKMER, A.M., KYVERYGA, P.M., GLADY, M.J., BLACKMER, T.M.

“…To evaluate the temporal patterns of N deficiencies in corn and assess the ability of remote sensing to diagnose N deficiencies during the vegetative growth of…”
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Optimal rates of nitrogen fertilization for a winter wheat-corn cropping system in northern China by Chen, X, Zhou, J, Wang, X, Blackmer, A.M, Zhang, F

“…The sequential growth of winter wheat and corn within one year is the main cropping rotation system in northern China, excess nitrogen (N) fertilizer…”
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Residue decomposition effects on nitrogen availability to corn following corn or soybean by Green, C.J. (Texas Tech Univ., Lubbock, TX.), Blackmer, A.M

“…Rates of N fertilization required to attain maximum yields of corn (Zea mays L.) usually are less for corn grown after soybean [Glycine max (L.) Merr.] than…”
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Fertilizer-Induced Advances in Corn Growth Stage and Quantitative Definitions of Nitrogen Deficiencies by ZHANG, J., BLACKMER, A.M., KYVERYGA, P.M., VAN DE WOESTYNE, B.W., BLACKMER, T.M.

“…Evidence that nitrogen （N） fertilization tends to accelerate maturation as well as increase rates of growth has received little attention when diagnosing N…”
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Nitrogen effects on conservation of carbon during corn residue decomposition in soil by Green, C.J. (Iowa State University, Ames, IA.), Blackmer, A.M, Horton, R

“…Nitrogen fertilization is widely recognized for its potential to help maintain soil organic matter (SOM) concentrations by increasing plant growth and amounts…”
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Release of fixed ammonium during nitrification in soils by Green, C. J., Blackmer, A. M., Yang, N. C.

“…Ammonium added to soils can be fixed by clay minerals and subsequently released. There is, however, uncertainty concerning how rapidly this release occurs. We…”
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Nitrogen turnover by sequential immobilization and mineralization during residue decomposition in soils by Blackmer, A.M. (Iowa State University, Ames, IA.), Green, C.J

“…Additions of 15N-labeled fertilizers to soils often induce mineralization of nonlabeled N, and such mineralization poses problems when interpreting the results…”
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Release of Nitrogen from Ureaform Fractions as Influenced by Soil pH by Tlustos, P., Blackmer, A. M.

“…Ureaforms are slow‐release N fertilizers that have potential for minimizing problems associated with leaching of NO‐3 from soils and accumulations of NO‐3 in…”
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