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Effect of phosphorus placement in re...

Martin, Kent Lee.

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Effect of phosphorus placement in reduced tillage crop production.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Effect of phosphorus placement in reduced tillage crop production./
作者:	Martin, Kent Lee.
面頁冊數:	313 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-05, Section: B, page: 2620.
Contained By:	Dissertation Abstracts International70-05B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3358764
ISBN:	9781109178449

Effect of phosphorus placement in reduced tillage crop production.
Martin, Kent Lee.

Effect of phosphorus placement in reduced tillage crop production. - 313 p.

Source: Dissertation Abstracts International, Volume: 70-05, Section: B, page: 2620.

Thesis (Ph.D.)--Kansas State University, 2009.

A number of questions are being raised concerning phosphorus (P) management as producers switch to minimum or no-tillage cropping systems. Benefits of P application are site specific and potential advantages need to be evaluated for each location. Deep band application effects on crop yield and soil P distribution have been studied, but conclusive results are lacking because of the complexity of environment and P placement interactions, particularly in moisture limited environments. Challenges in soil test sampling and interpretation have also affected P management in these reduced and no-tillage systems because of decreased confidence in soil test P data. The objectives of this research were to evaluate crop responses to P application rate and placement and to study the distribution of soil P concentration, both vertically and laterally at a number of locations in Kansas.

ISBN: 9781109178449Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Effect of phosphorus placement in reduced tillage crop production.
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245 1 0 $a Effect of phosphorus placement in reduced tillage crop production.
300 $a 313 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-05, Section: B, page: 2620.
500 $a Adviser: David B. Mengel.
502 $a Thesis (Ph.D.)--Kansas State University, 2009.
520 $a A number of questions are being raised concerning phosphorus (P) management as producers switch to minimum or no-tillage cropping systems. Benefits of P application are site specific and potential advantages need to be evaluated for each location. Deep band application effects on crop yield and soil P distribution have been studied, but conclusive results are lacking because of the complexity of environment and P placement interactions, particularly in moisture limited environments. Challenges in soil test sampling and interpretation have also affected P management in these reduced and no-tillage systems because of decreased confidence in soil test P data. The objectives of this research were to evaluate crop responses to P application rate and placement and to study the distribution of soil P concentration, both vertically and laterally at a number of locations in Kansas.
520 $a This research shows that crop growth at the sites evaluated was not negatively affected by P stratification, which was present at all sites at the beginning of the study. Phosphorus placement methods (broadcast and deep band) did not have significant effects on P responses. However, P application was required to achieve maximum yields at sites with low soil P, but high P sites did not consistently respond to P application. When P fertilizer was broadcast, shallow soil depths continued to have high soil test P, while deep band application increased soil P in the 7.6 to 15 cm depth. The addition of starter application with deep banding of P generally resulted in a more even vertical distribution of soil P. Soil test P data also demonstrated that the presence of bands can be confirmed through soil sampling, but the confidence of soil test P data in a vertical and lateral stratified soil was decreased. Soil samples taken from the band area had highly variable P (high coefficient of variation) concentrations likely due to an inability to sample from within the P band or variability in P application. Soil sampling in these management systems proves to be challenging and will need further research to identify improved methods for soil test P sampling and interpretation.
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790 1 0 $a Schlegel, Alan $e committee member
790 1 0 $a Williams, Kimberly A. $e committee member
790 1 0 $a Fleming, Sherry $e committee member
790 $a 0100
791 $a Ph.D.
792 $a 2009
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