что делать если парень не верит что это его ребенок
Главное меню:
Интересное
что делать если парень не верит что это его ребенок, Soil Survey Manual 2017; Chapter 7, Sampling – Soil Background and Risk Assessment, Soil Sampling Strategies for Site-Specific Field Management, Soil Sampling and Sample Preparation, Soil Sampling Guidelines - Purdue University, You are here: Web Soil Survey Home - USDA, A Field Guide to Soil Sampling - College of Agriculture and .
Managing soils with a site-specific approach has several potential benefits. When combined with variable rate technology, site-specific management distributes nutrients and other amendments according to the spatial variation in soil properties used to determine agronomic optimum amendment rates. In site-specific management, higher rates of amendments are typically applied to locations in the field where the potential crop response is greatest, and lower rates are applied in areas less likely to respond. The desired result of a site-specific management approach is not limited to optimizing growth and yield; producers also may be aiming for increased pest and disease resistance or a better quality crop. By matching the needs and production potential of the crop to a location in the field, amendments are distributed at prescribed amounts and set to meet production goals. The approach may also have environmental benefits: though higher nutrient rates are applied in the most productive areas, reduced rates in areas where nutrients are not needed can potentially lessen the impact of nutrient runoff on water quality. Furthermore, the correction of localized nutrient deficiencies should increase nitrogen use efficiency (since other nutrients will not be limiting) and potentially reduce the risk of nitrogen runoff and leaching., Soil Survey Data Collection, Management, and Dissemination. Introduction. D. uring the course of a soil survey, a large amount of data, of various types and in various formats, is commonly collected or developed. These data include, but are not limited to, field notes, soil profile and landscape descriptions, drawings, laboratory data, photographs,, The soil sample depths chosen for both the site and background reference areas should be consistent with the receptors (as described in the CSM) that are expected to have contact with the soil. As noted above, background and site sample locations should be similar in physical, chemical, geological, biological, and ecological characteristics .
For the recommended procedures for soil sampling, see the NC State Extension publication Careful Soil Sampling—The Key to Reliable Soil Test Information and the N.C. Department of Agriculture & Consumer Services publication Soil Sampling Basics. When labeling soil samples for use in site-specific field management, give each sample a unique , General guidelines on selecting sampling sites: For a general assessment of soil quality, select sample sites within a field that are representative of the field. Refer to soil maps of the area (Soil survey) to identify soil type differences and variations within the map unit (Figure 1). Figure 1) Soil maps with different soil types, correlating the soil test results with the area of the Figure 3. An example of zig-zag sampling pattern for whole field sampling. Subsamples are collected by traveling in a zig-zag pattern collecting subsamples at each locations indicated by black dots. Background lines represent the various soil types in the field. Ideally, zig-, NRCS has soil maps and data available online for more than 95 percent of the nation’s counties and anticipates having 100 percent in the near future. The site is updated and maintained online as the single authoritative source of soil survey information. Soil surveys can be used for general farm, local, and wider area planning., approaches on how to define your sample areas, but they generally fall into one of three options: A. Whole field sampling: This strategy uses one composite sample to represent a field of no more than 25 acres (or orchard blocks). B. Zone sampling: The field is subdivided into zones based on soil type (1), past management, .