Response in yield and leaf composition of soybean varieties to phosphorus, potassium, and calcium carbonate materials

Yield responses of soybeans [Glycine Max (L.) Merrill] to phosphorus and potassium fertilizers have the reputation of being small and inconsistent unless the soil tests low to very low with respect to these elements. Consequently, soybean fertilization is commonly left to the residual effect of fertilization of other crops in the rotation such as corn. Field experiments were conducted with the general objective to investigate means whereby the magnitude and consistency of soybean responses to fertilization may be improved. Differential responses exist in corn. Jones (18) concluded that some inbred lines have a lower K requirement than others and also are more sensitive to high K levels. Differential responses among soybean varieties may be studied in a side-by-side comparison in fertilizer trials, and measurement of differential responses among four varieties was the primary objective of this work

Condition Reporting and Resolution

This procedure facilitates a safety conscious work environment by providing a mechanism for employees to make management aware of existing and potential conditions. This procedure establishes the responsibilities and process to be used to ensure that conditions related to, but not limited to, the environment, safety, health, waste isolation, operations, security, or quality of items and services associated with Office of Civilian Radioactive Waste Management (OCRWM) work activities are promptly identified, controlled, evaluated, and corrected as soon as practical. This procedure describes the process flow, controls, interfaces, and requirements for condition identification and resolution. This includes adverse conditions as well as opportunities for improvement and suggestions

P and K Fertilizers for Corn - How to Apply

More Iowa corn acres could be fertilized profitably with phosphorus and potassium. Both hill (row) and broadcast application have their place. Here\u27s what research tells us about methods of application

Soybean yields and plant composition as affected by phosphorus and potassium fertilizers

The primary objective of this study was to determine if soybean grain yields could be predicted by the P and K content of the growing plant. A supporting objective was to find what plant parts should be taken, and at what stage of growth, to give the best relationship. Multiple curvilinear regression analysis was used to determine this relationship from data collected in four field experiments. Yields, chemical composition of soybean plant parts and other data were available from four similar fertilizer experiments conducted at various locations in Iowa in 1958. A randomized block 9 x 9 central composite design, containing various combinations of P and K fertilizer rates, was used in all experiments. Soybean plant samples from each plot, taken in three different growth stages, were separated into various plant parts and chemically analyzed for total P and K contents. (Growth stages used were: Stage 5-Nine to 10 trifoliate leaves unrolled with stem branching evident; full bloom with withered flowers in lower leaf axils. Stage 7-Pods plainly evident in plant tops; lower pods nearly full length with beans developing; flowering ceased. Stage 9-Bottom leaves beginning to yellow; top pods almost fully developed with beans nearing green bean stage.

What Fertilizers for Crop Rotation?

No one can predict the exact response of a single crop in a given year or at a specific location. Price relationships change, too. What should you do in a cropping sequence? Here are some clues from our long-term research

Role of Nitrogen, Phosphorus and Potassium fertilizers in continuous corn culture on Nicollet and Webster soils

The possibility of growing continuous corn is receiving increasing consideration with the changing agricultural patterns. Farmers are devoting more and more acres to intensive cropping sequences in which corn follows corn more often. The practice of continuous corn-growing consecutive corn crops on the same land-is on the increase. This is because corn is the most profitable crop generally grown in the Corn Belt, because limitations in production technology have been eased, and because farm product demands or values have altered. Early research with crop rotations generally resulted in conclusions that continuous culture of inter tilled crops, especially of corn, was less profitable than other alternatives and resulted in decreasing soil fertility and continuously declining yields. The early experiments indicated that a crop rotation, including a nitrogen-fixing legume, was needed to increase or even maintain fertility levels. These experiments usually did not explore the use of N, and, if they did, the N usually was used in low amounts, probably because of the high cost. Forage-producing crops were also necessary for the livestock program, which then included draft horses, and the manure byproduct from the animals helped maintain fertility levels

A Postscript to a Paper of A. Baker

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/135153/1/blms0075.pd

AN ANALYSIS OF CONSUMER PREFERENCES FOR DELAWARE FARMER DIRECT MARKETS

Consumer/Household Economics,

The influence of nitrogen and phosphorus ferilization on nutrient status and profitability of Bromegrass on Ida soils

This study was undertaken to determine the profitability and the feasibility of fertilizing bromegrass for grazing in the Monona-Ida-Hamburg soil association area. This area is well adapted to growing forage crops. Because of the high content of calcium and potassium, alfalfa grows well if phosphorus is applied. Bromegrass is able in some way to get nitrogen from alfalfa, and the two crops grow well together. The bloat danger in pasturing alfalfa or bromegrass-alfalfa mixtures, however, is well known to cattlemen in the area. Many believe the cost of nitrogen fertilizer to maintain productivity of bromegrass pastures is less than the cost of losses from bloat on bromegrass-alfalfa pastures. The profitability of fertilizing bromegrass stands is examined in Part I of the study. The feasibility is examined in Part II. In Part I, returns at three levels of nitrogen cost and beef price and at three conversion ratios of forage to beef are calculated on the basis of experimental yields

A CONJOINT ANALYSIS OF PAPER DEMAND BY COMMERCIAL GRAPHIC DESIGNERS

Conjoint analysis was used to evaluate the preferences of graphic designers toward kenaf paper. Results indicate that price is of overwhelming importance to designers in their purchasing decisions regarding paper stock. If priced competitively with existing wood and recycled papers, kenaf products should gain market share among designers.Demand and Price Analysis,