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)
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)