# Nitrogen relationships in grazed and cut grass-clover systems

> 1979 doctoral thesis by Philip Roger Ball at Massey University

**Wikidata**: [Q112837264](https://www.wikidata.org/wiki/Q112837264)  
**Source**: https://4ort.xyz/entity/nitrogen-relationships-in-grazed-and-cut-grass-clover-systems


## References

1. [Source](http://hdl.handle.net/10179/3710)