Nutrient Requirements of Mixed Forages

This new project is attempting to demonstrate how balancing N and P, and harvesting methods can improve stand life and productivity.

IPNI-1995-CAN-AB13

The percent legume in mixed grass-legume sward decreases with stand age resulting in poorer quality and often lower yielding forage. This new project is attempting to demonstrate how balancing N and P, and harvesting methods can improve stand life and productivity. Initial results are showing that N and P can influence the composition and yield of a mixed forage sward. Read more


Year of initiation:1995
Year of completion:1997
Map:

Interpretive Summary

Western Canada has more than 10 million acres of forage crops, much of which are mixed forage stands. Only 25 percent of the forage acreage is fertilized and then it is usually with low rates of fertilizer. This study, now complete, investigated N and P fertility of mixed foraged stands at two locations in Alberta. Four years of data show a consistent response to N fertilization, but P response has mainly been limited to one site.

This project is demonstrating the importance of balanced N and P fertility in mixed forage stands. Results show that N consistently increases first cut forage yields and that applying P further increases yields, although additional yield increases were small. For example, at one site, a 6 percent increase in response to P was observed compared to N alone. Forages fertilized with N and P also appear to maintain more uniform and vigorous alfalfa in the stand compared to surrounding areas.

The percent legume in mixed grass-legume sward decreases with stand age resulting in poorer quality and often lower yielding forage. This new project is attempting to demonstrate how balancing N and P, and harvesting methods can improve stand life and productivity. Initial results are showing that N and P can influence the composition and yield of a mixed forage sward.

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Updates & Reports

1998

1998 Annual Report

2001

Project Description


Project Leader

Jerome Lickacz, Alberta Agriculture, Food and Rural Development


Project Cooperators

None


IPNI Staff

Adrian Johnston


Location

Americas \ Northern America \ CAN \ Alberta


Topics

4r rate, 4r time, nutrient management

alfalfa, bromegrass

Phosphorus (P), Potassium (K)