A fast and inexpensive field method utilizing corn fields, grown under local farm conditions, was used to calibrate routine soil-testing methods in Southern Brazil. The various soil tests were calibrated against plant height and nutrient deficiency indexes. Scatter diagrams generally exhibited high ...
testing procedures (including both methods of analysis and their interpretations) for N and P to identify watershed or field areas likely to contribute significant amounts of N and P tosurface waterand groundwater through erosion, surface runoff, or leaching. Growing evidence from field research ...
This was an important act for ensurance national food security to extend the formula fertilization by soil testing,so as to be a natural choice to raise the comprehensive production capacity of arable land,and as well as an effective way to achieve efficient use of resources and protect the eco...
Routine soil-testing methods are excellent tools for monitoring soil fertility. However, if used for predicting optimal fertilizer requirements they will frequently fail. This applies especially to soils having high fertility levels needed for commercial farming with many other factors affecting plant growt...
Five soil test methods (Truog, Olsen, Bray 1 and 2, and Egner et al.) using two depths of soil, and volumes of soil as well as weights for Truog and Olsen, were compared as methods of predicting response to phosphate by grazed clover - grass pastures. Sixty-two field experiments were...
Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3(2,700 kN-m/m3)). ASTM ... A Arulrajah,MM Disfani,S Horpibulsuk,... - 《Construction & Building Materials》 被引量: 106发表: 2014年 Manual of Soil Laboratory Testing Extract...
Laboratory Measurement and Analysis of the Deteriorated Layer Permeability Coefficient of Soil-Cement Deteriorated in a Saline Environment The deterioration of soil-cement in a saline environment leads to a reduction in strength and an increase in permeability. Effective methods of determining... Q Jin...
Soil erosionby water is considered one of the major causes ofland degradationand a large number of investigations have been carried out aiming at developing and testing methods for the evaluation ofsoil erosionprocesses using GIS.Gulliesare among the main soil–water erosion features in various p...
631A631.4 Field Investigation Methods 631A631.5 Investigations Planning 631A631.6 Requesting Assistance 631A631.7 Laboratory Databases 631B631.10 Research Work Plan Checklist 631B631.11 Example Research Work Plan 631B631.12 Example of a Soil Characterization Work Plan ...
The summary statistics (SS) approach to area-to-point (ATP) kriging is applied to map organic matter concentration in the topsoil of agricultural fields from aggregated soil testing data. The differences between the SS approach and earlier published ATP kriging methods are explained and the behavior...