ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Triticum aestivum L.) yields are often improved by Cl- fertilization. Published reports on critical tissue concentrations and Cl- requirements for wheat are few in number. Our objectives were to define a critical plant Cl- concentration (head emergence) for maximum yield, develop a Cl- fertilizer recommendation, and determine the effect of Cl- fertilizer on grain protein. Thirty-two field experiments (18 winter and 14 spring wheat) were conducted in Montana between 1988 and 1995. Experiments included comparisons with multiple cultivars and Cl- rates (0-90 kg ha-1. Relative yield vs. plant Cl- concentration relationships were assessed from 219 cultivars x experiment episodes. Three zones of Cl- status were identified: (i) a deficiency zone, plant Cl- 〈1.0 g kg-1, where significant (P 〈0.10) yield responses to applied Cl- occurred in 59 of 86 episodes (69%); (ii) an adequate Cl- status zone, plant Cl-≥4.0 g kg-1, where yield responses occurred in only 2 of 44 episodes (〈5%); and (iii) a critical range between these two zones, where responses were observed in 25 of 89 episodes (28%). Regression of plant Cl- concentration on soil (0-60 cm) plus fertilizer Cl- revealed that deficient, critical range, and adequate Cl- zones were associated with 〈7.5, 7.5 to 32, and ≥33 kg Cl- ha-1, respectively. The proposed guideline for wheat is to add sufficient Cl- to reach the upper end of the critical range (4.0 g kg-1 plant Cl-). This recommendation ensures adequate Cl- nutrition for maximum yield and kernel weight, although at some sites a slight reduction in grain protein (0.5%) may result.
Type of Medium:
Electronic Resource
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