THE RELATION OF SOIL TEST VALUES TO FERTILIZER RESPONSE BY THE POTATO: III. EXCHANGEABLE POTASSIUM AND POTASSIUM FERTILIZER REQUIREMENTS

Revision of Potassium Soil-test Interpretations and Fertilizer Recommendations

There is a long history of potassium (K) fertilization research in the North-Central Region. Sustained Iowa field research efforts have focused on developing soil-test K (STK) interpretation and studying the effect of K fertilization strategies on grain yield and STK. Because of changes in the soil-test K method used in Iowa, information published over time should be evaluated separately. Publi...

Maize (Zea mays L.) Agro-Physiological Response to Potassium and Iron Fertilizer under Water Deficit Stress

This research was conducted to evaluate effect of potassium and iron fertilizers on agro-physiological traits affected different irrigation regime of corn in Shahryar (Tehran province, central of Iran) via a split-split plots arrangement based on randomized complete blocks design with three replications during 2015. The main plot included different irrigation regime (Normal irrigation and stop ...

Crop Potassium Nutrition – Implications for Fertilizer Recommendations

Response of Highbush Blueberry to Nitrogen Fertilizer during Field Establishment—II. Plant Nutrient Requirements in Relation to Nitrogen Fertilizer Supply

A study was done to determine the macroand micronutrient requirements of young northern highbush blueberry plants (Vaccinium corymbosum L. ‘Bluecrop’) during the first 2 years of establishment and to examine how these requirements were affected by the amount of nitrogen (N) fertilizer applied. The plants were spaced 1.2 · 3.0 m apart and fertilized with 0, 50, or 100 kg ha of N, 35 kg ha of pho...

Ability of black soil supplying potassium and effect of potassic fertilizer on soybean

The black land is distributed in a narrow area from south to north in northeast of China Nine soil samples with high, middle and low fertility were collected in the field of south, north and middle area. These samples were analyzed in laboratory, and pot experiment was performed mainly in Harbin. The results showed that Black soil has high potential of providing potassium, the concentration of ...