Using yield and protein history from dryland fields to improve nitrogen fertilizer recommendations

Typical of dryland, where fallowed wheat yields range from 15 to 45 Bu/A, neither yield nor protein responses to nitrogen (N) fertilizer are consistent (2, 3, 4, 8). Workers at the Tetonia and Aberdeen Branch Stations in Intermountain Idaho began trials as early as the 1940's, but there were no unifying concepts that would allow projection of trial results to individual farm fields. Therefore, few reports have been published, although trials have continued to date (1, 5, 8, 9). The purpose of this paper is to summarize and interpret the data collected over the entire period. We identified the two following goals: 1. The summary should be based on established agronomic relations, and 2. The results of the analysis should improve predictions of yield and protein responses to N fertilizer

Reproducibility of Soil Test Values Obtained by Different Field Sampling Techniques

Single-core soil samples were taken on a grid-pattern in nine fields in southern Idaho. Soil tests for sodium bicarbonate-soluble P and K, and DTPA-extractable Zn indicated wide variability of these elements in most fields. Analyses of composite samples taken from the same areas by two other persons and the single-core averages for each field agreed closely. The single-core average values and the values obtained from composite samples, while highly reproducible, were not reliable indicators for predicting fertilizer needs of the fields because areas testing low within the fields were not delineated. An initial intensive sampling, in which single-core samples are taken on a grid pattern and analyzed separately, is needed to determine the fertility variability of a field. Once the variability is established, areas may be selected to monitor soil test changes with time and cropping

Cropping and Fertilizing Wheat and Barley in the Camas Prairie - Fairfield Area

Wheat and barley grown every year with proper fertilization yielded as well as or better than when grown after fallow without fertilizer. Successful annual cropping requires: (1) selecting normal medium-textured (not droughty) soils, (2) controlling weeds, and (3) applying adequate nitrogen and sulfur. In general, annual cropping is a soil-conserving practice

Using yield and protein history from dryland fields to improve nitrogen fertilizer recommendations

Typical of dryland, where fallowed wheat yields range from 15 to 45 Bu/A, neither yield nor protein responses to nitrogen (N) fertilizer are consistent (2, 3, 4, 8). Workers at the Tetonia and Aberdeen Branch Stations in Intermountain Idaho began trials as early as the 1940's, but there were no unifying concepts that would allow projection of trial results to individual farm fields. Therefore, few reports have been published, although trials have continued to date (1, 5, 8, 9). The purpose of this paper is to summarize and interpret the data collected over the entire period. We identified the two following goals: 1. The summary should be based on established agronomic relations, and 2. The results of the analysis should improve predictions of yield and protein responses to N fertilizer

Reproducibility of Soil Test Values Obtained by Different Field Sampling Techniques

Single-core soil samples were taken on a grid-pattern in nine fields in southern Idaho. Soil tests for sodium bicarbonate-soluble P and K, and DTPA-extractable Zn indicated wide variability of these elements in most fields. Analyses of composite samples taken from the same areas by two other persons and the single-core averages for each field agreed closely. The single-core average values and the values obtained from composite samples, while highly reproducible, were not reliable indicators for predicting fertilizer needs of the fields because areas testing low within the fields were not delineated. An initial intensive sampling, in which single-core samples are taken on a grid pattern and analyzed separately, is needed to determine the fertility variability of a field. Once the variability is established, areas may be selected to monitor soil test changes with time and cropping

Cropping and Fertilizing Wheat and Barley in the Camas Prairie - Fairfield Area

Wheat and barley grown every year with proper fertilization yielded as well as or better than when grown after fallow without fertilizer. Successful annual cropping requires: (1) selecting normal medium-textured (not droughty) soils, (2) controlling weeds, and (3) applying adequate nitrogen and sulfur. In general, annual cropping is a soil-conserving practice

Synonymic notes on Lepidanthrax osten sacken and redescription of L. tinctus (Thomson) (Diptera, Bombyliidae, Anthracinae)

Based on the analysis of types, Lepidanthrax brachialis (Thomson, 1869) and L. quinquepunclatus (Thomson, 1869) are considered junior synonyms of L. tinctus (Thomson, 1869). Notes and illustrations of the type are presented