Producers utilizing a two year rotation of corn and soybean often apply fertilizer on a biannual basis, spreading recommended amounts of phosphorus and potassium for both crops prior to corn establishment. This approach minimizes application costs and is in accordance with university fertility recommendations that have found a low probability of fertilizer yield response when soils tested at the medium/optimum level or above. However, the field trials on which these state recommendations were developed are often several decades old. Increases in average corn and soybean yields and associated increases in crop nutrient removal rates have called into question the validity of these recommendations for current production environments. This stud...
Increasing corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] grain yields will require a compr...
The prevailing phosphorus (P) management system in Iowa and the Midwest is based on soil P testing, ...
Soils with improved fertility indicate opportunities for more rational use of fertilizers. The objec...
To determine if current university fertilizer rate and timing recommendations pose a limitation to h...
To determine if current university fertilizer rate and timing recommendations pose a limitation to h...
To determine if current university fertilizer rate and timing recommendations pose a limitation to h...
A long-term study was established in 1979 to evaluate the effect of various combinations of phosphor...
Although southeast Iowa soils are generally very productive, phosphorus (P) and potassium (K) must b...
Efficient P fertilization practices are of great concern to Corn Belt farmers because of the agronom...
Effects of nitrogen (N), phosphorus (P), and potassium (K) fertilization on a corn/soybean cropping ...
Many Iowa fields require phosphorus (P) and potassium (K) fertilization for optimum soybean producti...
No-till management results in little or no incorporation of crop residues and fertilizers with soil....
Increasing corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] grain yields will require a compr...
A long-term experiment has been conducted since 1979 at the ISU Northeast Research and Demonstration...
A 3-yr study was conducted to assess the effects of several potassium (K) fertilization rates on gra...
Increasing corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] grain yields will require a compr...
The prevailing phosphorus (P) management system in Iowa and the Midwest is based on soil P testing, ...
Soils with improved fertility indicate opportunities for more rational use of fertilizers. The objec...
To determine if current university fertilizer rate and timing recommendations pose a limitation to h...
To determine if current university fertilizer rate and timing recommendations pose a limitation to h...
To determine if current university fertilizer rate and timing recommendations pose a limitation to h...
A long-term study was established in 1979 to evaluate the effect of various combinations of phosphor...
Although southeast Iowa soils are generally very productive, phosphorus (P) and potassium (K) must b...
Efficient P fertilization practices are of great concern to Corn Belt farmers because of the agronom...
Effects of nitrogen (N), phosphorus (P), and potassium (K) fertilization on a corn/soybean cropping ...
Many Iowa fields require phosphorus (P) and potassium (K) fertilization for optimum soybean producti...
No-till management results in little or no incorporation of crop residues and fertilizers with soil....
Increasing corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] grain yields will require a compr...
A long-term experiment has been conducted since 1979 at the ISU Northeast Research and Demonstration...
A 3-yr study was conducted to assess the effects of several potassium (K) fertilization rates on gra...
Increasing corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] grain yields will require a compr...
The prevailing phosphorus (P) management system in Iowa and the Midwest is based on soil P testing, ...
Soils with improved fertility indicate opportunities for more rational use of fertilizers. The objec...