588-4 Effects of Storage Methods on Manure Systems and Manure Decomposition in Soil in Small-Scale Kenyan Systems.

Poster Number 509

See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nitrogen and Phosphorus Management (Graduate Student Poster Competition) (Posters)

Monday, 6 October 2008
George R. Brown Convention Center, Exhibit Hall E

Helen Markewich1, Alice N. Pell1, David M. Mbugua1, Debbie Jeannine Ray Cherney1, Harold van Es2, Johannes Lehmann3 and James B. Robertson1, (1)Department of Animal Science, Cornell University, Ithaca, NY
(2)Cornell University, Ithaca, NY
(3)909 Bradfield Hall, Cornell Univ., Ithaca, NY
Abstract:

Cattle manure is a commonly used soil amendment that, with proper management, can provide plant-available N but manure management techniques vary among smallholder Kenyan farms.  This study aimed to examine the effects of manure storage method on the neutral detergent fiber-bound N (NDIN) content of manure.  Management strategies were varied in terms of how the manure was contained and shaded, and how frequently fresh material was added to the pile. In a randomized complete block design experiment, manure samples from one better-managed dairy farm (Farm A) and from one with inferior management (Farm B) were stored for 30 d to determine if the management methods and the manure source affected the N composition of the manure. Every 6 d, 3 replicates of each of 8 treatments were non-destructively sampled.  After 30 d, the manure was buried in soil in large- and small-mesh litterbags to determine the disappearance of organic-N over four mos.  For each of the 24 storage replicates, there were 7 litterbags of each size to be removed from the soil at 7 intervals over 112 d.  Only the manure source (P<0.01) and the time in storage (P<0.01) affected the N composition of the stored manure.  Manure source, i.e. the herd that produced the manure, was also the only factor that affected the NDIN disappearance in soil (P<0.01).  Preliminary data: 

Farm

Mesh

Small

Large

%NDINsd, after 30d storage

A

4.10.9

%NDIN lostsd after 112d in soil

4.90.8

6.90.1

B

4.60.8

1.31.2

5.10.6

The manure from the better-managed farm degraded faster, suggesting that more nutrients would be available to plants within one growing season if this manure was used as a soil amendment.  These results suggest that a good area of focus in manure management may be on the cattle diet, which affects manure quality and its decomposition in soil. 

See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nitrogen and Phosphorus Management (Graduate Student Poster Competition) (Posters)