Clamping assembly for inertial components Patent

Inertial component clamping assembly design for spacecraft guidance and control system mountin

Crop Rotations - Facts and Fiction

A wide range of cropping systems will give high corn yields. Whether or not to rotate crops may depend on the land slope. We don\u27t have all the answers but here\u27s more about these and other crop rotation facts

Soil and Crop Management Practices for Iowa - Part II: Corn and Soybeans

Soil and crop management practices for oats and meadow appeared in the January issue of Iowa Farm Science. This second section by the same authors deals with soil and crop management practices for corn and soybeans

Soil and Crop Management Practices for Iowa - Part I: Oats and Meadows

We believe you now have a greater latitude and more alternatives in soil and crop management than was thought possible even 5 years ago. But to obtain highest yields, these management practices may be more exacting than was previously believed to be true

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

Production functions and methods of specifying optimum fertilizer use under various uncertainty conditions for hay

Farmers who use fertilizer on a crop are concerned with at least two uncertainty problems relating to the amount of fertilizer that maximizes profits. Both of these problems arise, in part, from weather, a common underlying cause. First, crop yield is uncertain. Thus, a quantity of fertilizer applied, with the decision made before planting, may not be optimum for the yield actually obtained. Second, at the time of planting, future crop use or price may also be indefinite. The value of hay, for example, may differ according to the method of utilization. Hence, a particular amount of fertilizer applied in the spring may not provide the optimum value product at the end of the season. This study is concerned with the estimation of production functions and the analysis of uncertainty problems as they relate to fertilization of alfalfa with P2O5 and K20. The basic data are taken from an experiment in which three hay cuttings were obtained during the 1952 growing season on Weller silt loam in Van Buren County, Iowa

A Postscript to a Paper of A. Baker

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

Estimated crop yields on Iowa soils

Everyone interested in agriculture is concerned, to some degree, with estimating crop yields. Estimated yields are a basis for appraising farmland and frequently are used for establishing rental arrangements and determining farm sale and loan values. They also are used in planning the farm business and in developing various agricultural programs.https://lib.dr.iastate.edu/specialreports/1022/thumbnail.jp