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Lime effects on P availability

Westermann, D.T. (1987) Lime effects on P availability. pp. 79-85. In: Proc. 38th Annual Northwest Fertilizer Conference. USA-WA-Pasco, 1987/07/14-15.

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Nutrient uptake can be predicted by assuming that plant roots absorb
nutrients from the soil solution and that the rate of absorption is dependent
upon the nutrient concentration in the soil solution (2). The root growth
rate also affects P uptake since uptake is directly proportional to active
root surface area, particularly new root hairs. The three main soil
characteristics that describe the P supply to the plant root are: (a) P
concentration in the soil solution before growth, (b) the ability of the soil
to replenish the P in the soil solution, the buffer power, and (c) the P
diffusion rate through the soil. The diffusion process is the main supply
mechanism for P reaching the root surface.

There are several factors that directly or indirectly influence soil and
fertilizer P availability. These include soil, fertilizer, management, and
environmental characteristics. Additional details of the complex reactions
and interactions are beyond the scope of this paper, but can be found in
recent reviews (4, 7).

A nutrient survey showed that 25 out of 123 potato fields in Idaho had
soil test P concentrations (STPC) more than adequate, but petiole PO4-P
concentrations considered to be deficient (11). The significance of the
petiole PO4-P concentration in relation to plant growth needs have been better
defined (12) since that report. This paper presents data showing the effects
of lime on soil solution P concentrations and P uptake by plants.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 0670
Subjects: Mass Import - unclassified
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:57
Last Modified: 05 Jan 2017 19:08
Item ID: 1050