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1. Potassium Placement in Conservation Tillage- cropping System ConsiderationsSoil fertility specialists have repeatedly observed that significant stratification of both P and K occurs on fields which are kept in no-till production, even if that time period is as short as three years. The actual degree of K stratification is affected by soil texture, the method of fertilizer application, crop rotation history, precipitation levels and surface residue management. Potassium stratification isn't inherently deleterious to crop production in a given environment. Crop yield losses... |
2. No-till Soybean Responses to Residual Fertilizer K and Site-Specific Exchangeable K on Variable Soilst Because meeting the potassiuln (K) requirements of no-till soybean is more dependent on soil properties near the soil surface than it is in conventional soybean production, management of both tillage systems and K fertilizer application in the preceding corn crop may also be critical for the subsequent no-till soybean crop. Both stratification and spatial variability in soil exchangeable K may constrain the achievement of satisfactory yields and consistent seed quality in no-till soybean. The objective... |
3. Plant Population Influences on Maize Physiological Responses to Nitrogen ApplicationPast genetic improvements in maize ( Zea mays L.) have led to the creation of modern hybrids that are increasingly tolerant to a variety of stresses and, in particular, to high plant populations. However, high plant densities can adversely a ffect overall grain yield due to greater intra- specific (within species) competition for lim iting resources. This competition increases barrenness and plant-to-plant variability for grain yield (GY CV) and other morpho-physiological traits. In this study, we... |
4. Factors Affecting the Relative Benefit of Deep-banding versus Broadcast Application of Phosphorus and Potassium for Corn and SoybeanScientifically based recommendations concerning the choice of deep banding versus traditional broadcast application of phosphorus (P) and potassium (K) for corn and soybean production in conservation tillage systems have been hampered by insufficient research and inconsistent results. Even when the decisi on is made (e.g. by strip-tillage corn farmers) to go with deep- banding of P and K, numerous questions remain about fertilizer rates, optimum deep-banding depth and frequency, whether to have a... |