Evaluation of Nitrogen Supply Rate Measured by in situ Placement of Plant Root Simulator Probes as a Predictor of Nitrogen Supply from Soil and Organic Amendments in Potato Crop
Sharifi, M.S., D.H. Lynch, B.J. Zebarth, Z. Zheng and R.C. Martin . 2009. American Journal of Potato Research 86: 356-366
Abstract
Nitrogen (N) supply from organic sources to the
potato (Solanum tuberosum L.) crop is difficult to predict
and to synchronize with crop demand. In this study, Plant
Root Simulator™ (PRS™) probes were evaluated as a tool
for prediction of N supply from two rates (300 vs. 600 kg N
ha-1) of either a hog manure-sawdust compost (HMC) or a
pelletized dehydrated poultry manure (NW) in Atlantic
Canada. The cumulative PRS mineral N supply rate
(PRS-N) measured for the period of 31 days after planting
(DAP), soil mineral N at 10 DAP and soil NO3-N at 31 DAP
were closely related to plant N uptake (PNU) (r=0.77, 0.71
and 0.73, respectively; P<0.001) and PNU plus soil mineral
N to 30 cm depth at tuber harvest (PNU SMNh) (r=0.77,
0.81 and 0.74, respectively; P<0.001). The supply of N from
organic sources to a potato crop can be predicted by PRS-N
early in the growing season.
Key Words
Hog manure-sawdust compost, Nutriwave, Soilmineral N, Pelletized dehydrated poultry manure, Plant Nuptake, PRS™probes
