In:
Journal of Plant Nutrition and Soil Science, Wiley, Vol. 180, No. 6 ( 2017-12), p. 659-666
Abstract:
The high potassium (K)‐fixing capacity of calcareous soils with homogeneous K supply limits crop K concentration. The objective of this study was to determine the increase in the leaf K concentration of tobacco ( Nicotiana tabaccum L.) with a heterogeneous K supply. Two field experiments were conducted from 2013 to 2015 with five K rates applied in homogeneous environments and one K rate applied in varying fractions of soil volume (from 0% to 100%) in heterogeneous environments. Under ridge culture, leaf biomass was not significantly affected by homogeneous (K rate) or heterogeneous (patch size) K management. Under homogeneous conditions, increasing the K supply to three times the standard rate used by farmers (249 kg K ha −1 ) increased leaf K concentration significantly, but the effect was limited and not cost‐effective. Heterogeneous supply of K fertilizer at the standard K rate in patches of 0–40% of soil volume outperformed homogeneous K supply in terms of leaf K concentrations. Furthermore, K fertilizer mixed in intermediate soil volume fractions of 1–20% resulted in higher leaf K concentrations than the smallest (0%) and larger (30–40%) soil fractions. However, such K‐rich patch application should be managed precisely with specific placement due to the sharp reduction in available K with increasing distance from the fertilizer. To maximize the sorption of immobile K, the match between the uptake volume of the rhizosphere and the area available for K diffusion is important.
Type of Medium:
Online Resource
ISSN:
1436-8730
,
1522-2624
DOI:
10.1002/jpln.201700023
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
1481142-X
detail.hit.zdb_id:
1470765-2
detail.hit.zdb_id:
200063-5
SSG:
12
SSG:
13
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