Effect of Phosphorus Fertilization on Field Pea Nitrogen Production

A site at Froid, MT was selected for the study, with a background soil P level of 19 mg P/kg of soil. A split-plot design was used with tillage (ZT vs CT) as the main plot, and crop and P rate as the subplots. The crops were spring wheat and field pea, with both crops in rotation present each year. The P rates were 0, 20, 40 and 80 kg P205/ha, applied as MAP in year 1 and TSP in year 2. In year 1 the varying N rates in the MAP applied was balanced so that all treatments received 16 kg N/ha. Results from the project show a positive grain yield response to field pea from fertilizer P addition, with maximum yields achieved at 40 kg P205/ha. These responses were recorded even though soil test P levels would have indicated P sufficiency. The spring wheat did not respond to P application rates. Pea grain N uptake was positively influenced by fertilizer P rates, with N uptake increasing with P rate. This occurred while no difference was observed in N uptake in the pea crop residue. Soil test results show a very clear decline in soil test P levels in the absence, or with low rates of fertilizer P application. Only the 40 kg P205/ha fertilizer rate maintained soil test P at a level similar to the start of the study. We would like to evaluate seed P content as a means of determining the P balance (inputs vs removal) from the trial site.

IPNI-2006-USA-MT16

A site at Froid, MT was selected for the study, with a background soil P level of 19 mg P/kg of soil. A split-plot design was used with tillage (ZT vs CT) as the main plot, and crop and P rate as the subplots. The crops were spring wheat and field pea, with both crops in rotation present each year. The P rates were 0, 20, 40 and 80 kg P205/ha, applied as MAP in year 1 and TSP in year 2. In year 1 the varying N rates in the MAP applied was balanced so that all treatments received 16 kg N/ha. Read more


Year of initiation:2006
Year of completion:2006
Map:

Interpretive Summary

2006

Effect of Phosphorus Fertilization on Field Pea Nitrogen Production, 2006 Field pea fixes its own N, but is very dependent on using soil or fertilizer P, K, and S to both fix N and increase grain yields. A study was conducted at Culbertson, Montana, to evaluate the effect of fertilizer P use on field pea yields and P uptake in the grain.


Updates & Reports

2006

Methodology

2006

Objectives

2006

Justification

2006

Project Description


Project Leader

Jed Waddell, USDA-ARS


Project Cooperators

Andy Lenssen


IPNI Staff

T. Jensen


Location

Americas \ Northern America \ USA \ Montana


Topics

4r place, 4r rate, crop quality, cropping practices, nutrient management, soil sampling

field pea, wheat

Nitrogen (N), Phosphorus (P)