The impact of phosphorus fertilizer placement on crop production
Date
2014-03-11
Authors
Karamanos, R.E.
Flore, N.A.
Harapiak, J.T.
Stevenson, F.C.
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Abstract
Improved phosphorus (P) fertilizer management is viewed as a way to improve yields in highly
productive cropping system. A study was conducted at numerous sites during the 1990’s to
assess plant density and yield of canola (Brassica napus L.), barley (Hordeum vulgare L.), spring
wheat (Triticum aestivum L.), and winter wheat respond to greater P fertilizer rates (0, 15, 30, 45,
and 60 kg P ha-1) when seed placed and side banded. We did find that canola stand was
insensitive to rates of P tested when banded, but greater rates of seed-placed P caused stand
thinning. It is thought the compensatory growth of canola was the reason why canola yield did
not respond to P treatment. Both barley and winter wheat yielded most when the greatest rates of
P were applied. Spring wheat showed a similar response when P was side banded, thus
indicating improved tolerance with P placed away from seed. Therefore, spring wheat was the
only crop that fit with our hypotheses; side banding P will allow crops to respond positively to
greater rates of P fertilizer. The fact the cereal crop density was unresponsive to P management
indicates that seedlings show early-season better tolerance than canola. Unlike canola, yield-forming
factors for cereal crops responded to greater rates of P.
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Part Of
Soils and Crops Workshop