EffectofTillage

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News-Reports

Published on October 4, 2007

Author: DC_Cloepatra

Source: authorstream.com

Effect of Tillage on Alfalfa N Credit to Winter Wheat:  Effect of Tillage on Alfalfa N Credit to Winter Wheat K. A. Kelling, P. E. Speth and T. Wood Department of Soil Science University of Wisconsin-Madison and Lancaster Ag Research Station N Credit Questions with Wheat:  N Credit Questions with Wheat 1. Amount of N available to wheat? 2. Timing of release relative to wheat need? 3. Tillage effects? 4. Too much N? Experimental variables::  Experimental variables: Tillage No-till or moldboard plow Fall N rate 0 or 30 lb N/a Spring N rate 0, 20, 40 or 60 lb N/a (Fall + spring N = 0, 20, 30, 40, 50, 60, 70 or 90 lb N/a) Site characteristics and experimental details::  Site characteristics and experimental details: Wheat management details::  Wheat management details: Significant* probability values for tillage wheat experiment::  Significant* probability values for tillage wheat experiment: *pr  0.10 Yield response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1998:  Yield response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1998 Spring N rates (lb/a) NO-TILL MOLDBOARD PLOW Yield response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1999:  Yield response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1999 NO-TILL MOLDBOARD PLOW Spring N rates (lb/a) Yield response of wheat following alfalfa as affected by tillage and fall and spring N rates at Lancaster, 1999:  Yield response of wheat following alfalfa as affected by tillage and fall and spring N rates at Lancaster, 1999 NO-TILL MOLDBOARD PLOW Spring N rates (lb/a) Autumn temperature deviations for alfalfa wheat experiment::  Autumn temperature deviations for alfalfa wheat experiment: Lodging response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1998:  Lodging response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1998 NO-TILL MOLDBOARD PLOW Spring N rates (lb/a) Lodging response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1999:  Lodging response of wheat following alfalfa as affected by tillage and fall and spring N rates at Arlington, 1999 NO-TILL MOLDBOARD PLOW Spring N rates (lb/a) Lodging response of wheat following alfalfa as affected by tillage and fall and spring N rates at Lancaster, 1999:  Lodging response of wheat following alfalfa as affected by tillage and fall and spring N rates at Lancaster, 1999 NO-TILL MOLDBOARD PLOW Spring N rates (lb/a) Wheat yield vs. N applied for Arlington, 1999:  Wheat yield vs. N applied for Arlington, 1999 Other results::  Other results: Plowing increased available N by about 40 lb/a No difference between fall versus spring applied N N credit to corn for this stand = 120 lb N/a; for wheat only about 60 lb N/a Summary::  Summary: No response to N for wheat following alfalfa when plowed When no-tilled response to only about 20 lb N/a (2 of 3 years) Lodging increased linearly with N rate applied Fair stand with 6-8 inches of regrowth supplied about 60 lb N to wheat Plowing increases N credit about 40 lb N/a

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