G80-513 Protect Soil With Vegetative Residues

Keeping a protective cover of vegetative residues on the soil surface is the simplest and surest way to control both water and wind erosion. Crop residues are vital to conservation of soil and water. Keeping a protective cover of vegetative residues on the soil surface is the simplest and surest way to control both water and wind erosion. Vegetative residues on the soil surface improve infiltration of water into the soil, reduce evaporation, and aid in maintaining organic matter. Residues left upright all winter trap snow which increases soil water

Toward the total synthesis of spirastrellolide A. Part 3: Intelligence gathering and preparation of a ring-expanded analogue

Different methods for the formation of the C.25–C.26 bond of spirastrellolide A (1) are evaluated that might qualify for the end game of the projected total synthesis, with emphasis on metathetic ways to forge the macrocyclic frame

Effects of No-tillage Fallow as Compared to Conventional Tillage in a Wheat-fallow System

The benefits of reducing tillage by use of herbicides for weed control emphasizes why research was started to study a fallow system where all tillage was replaced by herbicides. Wheat planting was then the only soil disturbing operation. Objectives of the research were to compare the effects of no-tillage (chemical), stubble-mulch and plow (bare fallow) systems of fallow on: 1. Grain yield. 2. Grain protein. 3. Residue retention. 4. Soil nitrate-nitrogen accumulation. 5. Soil water accumulations during fallow. Data presented are in the form of a progress report. These experiments will continue

EC58-123 Questions and Answers about Stubble Mulching

Extension Circular 58-123 provides questions and answers about Stubble Mulch farming

EC58-123 Questions and Answers about Stubble Mulching

Extension Circular 58-123 provides questions and answers about Stubble Mulch farming

Date of Planting Studies of Winter Wheat and Winter Barley in Relation to Root and Crown Rot Grain Yields and Quality

This study was undertaken to determine the nature of root and crown rot of wheat and to ascertain the proper time to plant winter wheat so as to conserve moisture, minimize root and crown rot and thereby maximize yield. Studies conducted for 15 years at several locations in western Nebraska reveal that planting date is a significant factor for higher yields, particularly in certain years

Toward the Total Synthesis of Spirastrellolide A. Part 2: Conquest of the Northern Hemisphere

North and South: The unique biological activity of the natural product spirastrellolide A renders it an attractive lead for anticancer agents. The southern hemisphere (C1–C25) and the northern hemisphere (including the chlorinated [5,6,6]-bis-spiroacetal entity and the lateral C42–C47 chain) are prepared by concise and efficient routes. Consequently, the entire carbon framework of this potent phosphatase inhibitor, which contains 21 chiral centers, is prepared in an optically active form, and an important step toward structure determination by total synthesis is achieved

Toward the Total Synthesis of Spirastrellolide A. Part 1: Strategic Considerations and Preparation of the Southern Domain

North and South: The unique biological activity of the natural product spirastrellolide A renders it an attractive lead for anticancer agents. The southern hemisphere (C1–C25) and the northern hemisphere (including the chlorinated [5,6,6]-bis-spiroacetal entity and the lateral C42–C47 chain) are prepared by concise and efficient routes. Consequently, the entire carbon framework of this potent phosphatase inhibitor, which contains 21 chiral centers, is prepared in an optically active form, and an important step toward structure determination by total synthesis is achieved

Weed Control for Reduced Tillage Systems

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