Field studies were conducted at the Central Potato Research Institute
Campus, Modipuram (India), during two seasons (2003–2004 and 2004–2005), with
two processing cultivars (cvs Kufri Chipsona-1 and Kufri Chipsona-2) and nine
combinations of potassium source (K-chloride, K-sulphate and K-nitrate) and time of
K application (basal dressing, split application and split application + foliar spray) to
investigate their effect on tuber yield and processing attributes for crisp production
under subtropical conditions. Yearly variations were observed for most of the
variables studied. Between cultivars, the tuber and biomass yield was higher in cv.
Kufri Chipsona-1, whereas specific gravity, tuber dry-matter percentage and crisp
recovery were higher in cv. Kufri Chipsona-2. Stem number, plant height and
compound leaf number were not influenced by sources of K fertilizer or application
time. Processing-grade tuber yield, total tuber yield and biomass yield were
statistically similar for K-chloride and K-sulphate and lower for K-nitrate. K sources
affected both specific gravity and tuber dry-matter percentage significantly; Ksulphate
and K-nitrate gave significantly higher values than K-chloride. The
application time had no significant effect on processing grade and total tuber yield
or on tuber specific gravity and dry-matter percentage. Values for crisp colour and
reducing sugars were within the acceptable range for all treatments. Crisp yields
were calculated to be highest and oil percentage of the crisps to be lowest when Ksulphate
was applied as K fertilizer. Net income and benefit:cost ratio were highest
for K-chloride followed by K-sulphate and lowest for K-nitrate. The study suggests
that for crisping potatoes, K-sulphate is more suited than K-chloride, as it not only
increased tuber dry-matter percentage and crisp yield, but also decreased crisp oil
percentage.
Field studies were conducted at the Central Potato Research InstituteCampus, Modipuram (India), during two seasons (2003–2004 and 2004–2005), withtwo processing cultivars (cvs Kufri Chipsona-1 and Kufri Chipsona-2) and ninecombinations of potassium source (K-chloride, K-sulphate and K-nitrate) and time ofK application (basal dressing, split application and split application + foliar spray) toinvestigate their effect on tuber yield and processing attributes for crisp productionunder subtropical conditions. Yearly variations were observed for most of thevariables studied. Between cultivars, the tuber and biomass yield was higher in cv.Kufri Chipsona-1, whereas specific gravity, tuber dry-matter percentage and crisprecovery were higher in cv. Kufri Chipsona-2. Stem number, plant height andcompound leaf number were not influenced by sources of K fertilizer or applicationtime. Processing-grade tuber yield, total tuber yield and biomass yield werestatistically similar for K-chloride and K-sulphate and lower for K-nitrate. K sourcesaffected both specific gravity and tuber dry-matter percentage significantly; Ksulphateand K-nitrate gave significantly higher values than K-chloride. Theapplication time had no significant effect on processing grade and total tuber yieldor on tuber specific gravity and dry-matter percentage. Values for crisp colour andreducing sugars were within the acceptable range for all treatments. Crisp yieldswere calculated to be highest and oil percentage of the crisps to be lowest when Ksulphatewas applied as K fertilizer. Net income and benefit:cost ratio were highestfor K-chloride followed by K-sulphate and lowest for K-nitrate. The study suggeststhat for crisping potatoes, K-sulphate is more suited than K-chloride, as it not onlyincreased tuber dry-matter percentage and crisp yield, but also decreased crisp oilpercentage.
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