The evaluation of potassium metaphosphate as a source of potassium for potatoes with special references to foliar diagnosis, yield and quality of tubers

1966 ◽  
Vol 67 (2) ◽  
pp. 281-285 ◽  
Author(s):  
D. Lachover ◽  
Helena Feldhay
Keyword(s):  
Potassium Chloride ◽  
Normal Development ◽  
Application Rate ◽  
Potassium Sulphate ◽  
High Potassium ◽  
Potato Plants ◽  
Yield And Quality ◽  
K Fertilizer ◽  
Foliar Diagnosis

1. The availability of K in potassium metaphosphate was investigated in an experiment with large pots using a red sandy soil, low in exchangeable potassium. Potatoes were grown. The effects of potassium metaphosphate in three different granule sizes, applied at two rates, were compared with those of equivalent potassium chloride and potassium sulphate.2. Characteristic deficiency symptoms appeared in plants receiving no K and the crop responded to K fertilizer in potassium concentration, yields of tubers, and dry matter, and starch concentrations.3. Potassium metaphosphate, regardless of granule size and of application rate, was as effective as potassium chloride and potassium sulphate in giving normal development of potato plants, high potassium uptake in the foliage, and yield of tubers.

Effect of Nitrogen Fertilization on Yield and Quality of Endive

2009 ◽  
Vol 70 (1) ◽  
pp. 193-201 ◽  
Author(s):  
Katarzyna Adamczewska-Sowińska ◽  
Cecylia Miłowana Uklańska
Keyword(s):  
Nitrogen Fertilization ◽  
Nutritional Value ◽  
Growth Yield ◽  
Dry Weight ◽  
Application Rate ◽  
Marketable Yield ◽  
Nitrate Accumulation ◽  
Yield And Quality ◽  
Nitrogen Application Rate

Effect of Nitrogen Fertilization on Yield and Quality of EndiveThe aim of the experiments carried out in 2007-2008 was to assess the effect of various nitrogen doses on the growth, yield and nutritional value of two endive cultivars Cigal and Excel. The effects of two types of fertilizers were compared: that of ammonium nitrate with that of the product Entec-26. On the basis of the results obtained, it was shown that endive cv. Excel produced a marketable yield that was on average by 35.5% higher than that of the cultivar Cigal. A significantly higher marketable yield of endive was obtained by fertilizing with a single dose of the fertilizer Entec-26, particularly at the rates of 90 and 135 kg N·ha-1, and also 180 kg N·ha-1. The experiments also revealed a significant effect of the fertilization method and nitrogen application rate on the biological value of the endive cultivars under evaluation. The cultivar Excel was characterized by a higher degree of nitrate accumulation, whereas the cultivar Cigal had a higher vitamin C content, dry weight, and chlorophyll content.

The effect of quantity, source and time of application of nitrogen fertilizers on the yield and quality of Andropogon gayanus at Shika, Nigeria

1975 ◽  
Vol 84 (3) ◽  
pp. 529-535 ◽  
Author(s):  
R. J. Haggar
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Calcium Nitrate ◽  
Application Rate ◽  
Nitrogen Fertilizers ◽  
Time Of Application ◽  
Yield And Quality ◽  
Andropogon Gayanus

SUMMARYExperiments made at Shika, Nigeria, over a period of 3 years showed that the drymatter response of Andropogon gayanus to applied N was curvilinear over the range 0–896 kg N/ha, with maximum yields being obtained at an application rate of about 500 kg N/ha. However, the highest return of dry matter per unit of fertilizer applied (14·4 kg D.M./kg N) occurred at 28 kg N/ha and there was only a modest increase in crude-protein content as N was increased, reaching a maximum of 10·5% at the highest level of N. Also, at both high and intermediate levels of N, A. gayanus was replaced by less desirable grasses.May, the beginning of the rainy season, was found to be the most efficient time to apply N, although reasonable dry-matter responses were obtained by applying N in the dry season. ‘Nitro-chalk’ and calcium nitrate were more efficient sources of N than urea, sodium nitrate and, in the long term, ammonium sulphate.

scholarly journals The effect of non-targeted application of propiconazole on the yield and quality of malt barley

2012 ◽  
Vol 92 (2) ◽  
pp. 341-349 ◽  
Author(s):  
R. E. Karamanos ◽  
N. A. Flore ◽  
J. T. Harapiak ◽  
F. C. Stevenson
Keyword(s):  
N Fertilizer ◽  
Yield Potential ◽  
Fertilizer Treatment ◽  
Fertilizer Rate ◽  
Net Returns ◽  
Yield And Quality ◽  
K Fertilizer ◽  
Malt Barley ◽  
Fertilizer Rates

Karamanos, R. E., Flore, N. A., Harapiak, J. T. and Stevenson, F. C. 2012. The effect of non-targeted application of propiconazole on the yield and quality of malt barley. Can. J. Plant Sci. 92: 341–349. There is a desire to use non-targeted applications of foliar fungicide to improve malting barley production under higher fertility situations. An experiment was conducted at 80 sites (location by year combinations) with a 12 combinations of N/P/K rate-placement to determine if applications of propiconazole improve malt barley yield and quality under high fertility conditions. Treatment differences for days to maturity were no greater than about 1 d. Fungicide by fertility treatment interactions were not significant (P>0.05). Applications of propiconazole improved yield by 305 kg ha−1 (6%) and plump kernels by 3 g kg−1 (3%) across all fertility treatments, which included N fertilizer rates ranging from 0 to 90 kg N ha−1. The effect of fungicide on yield was greatest at sites with highest yield potentials (ca. 8000 kg ha−1) and was not statistically significant at lower-yielding sites (ca. 3000 kg ha−1). Application of propiconazole also improved net returns [barley revenue – (N cost+propiconazole cost+other operating costs)] by $22 ha−1 with higher barley priced ($190 T−1) and high yield potentials. At sites with low yield potential, the application of propiconazole resulted in net losses of about $7 ha−1 compared with not applying propiconazole. Nitrogen fertilizer rates from 0 to 90 kg N ha−1 (15/30-0 P-K fertilizer treatment combinations) increased yield and protein concentration, and reduced plump kernels in a curvilinear fashion when averaged across fungicide treatments. Net returns were maximized at N fertilizer rates slightly less than 90 kg N ha−1, depending on the price/cost regime. Consequently, malt barley producers will have to consider tradeoffs regarding N fertilizer rate that optimizes yield/returns and kernel quality. Also, decisions regarding fungicide applications and N/P/K fertilizer rate-placement applications can be made independent of each other for malt barley production.

Effect of rate and timing of potassium chloride application on the yield and quality of potato (Solanum tuberosum L. ‘Russet Burbank’)

2012 ◽  
Vol 92 (4) ◽  
pp. 783-794 ◽  
Author(s):  
Ramona M. Mohr ◽  
Dale J. Tomasiewicz
Keyword(s):  
Solanum Tuberosum ◽  
Potassium Chloride ◽  
Solanum Tuberosum L ◽  
Russet Burbank ◽  
Soil Test ◽  
Marketable Yield ◽  
Yield And Quality ◽  
K Concentration ◽  
Soil Test K

Mohr, R. M. and Tomasiewicz, D. J. 2012. Effect of rate and timing of potassium chloride application on the yield and quality of potato ( Solanum tuberosum L. ‘Russet Burbank’). Can. J. Plant Sci. 92: 783–794. Potassium is frequently applied to irrigated potato in Manitoba. Field experiments were conducted at two sites in each of 2006, 2007 and 2008 to assess effects of rate and timing of potassium chloride (KCl) application on the yield, quality, and nutrient status of irrigated potato (Solanum tuberosum ‘Russet Burbank’) in southern Manitoba. Preplant application of KCl increased total and marketable yield at one site, and tended (0.05<P ≤ 0.10) to increase total and marketable yield at three additional sites. At three of the four K-responsive sites, soil test K levels were <200 mg NH4OAc-extractable K kg−1, the level below which K fertilizer is recommended based on existing guidelines. Effects of timing of KCl application on total and marketable yield were limited although, averaged across sites, KCl applied at hilling reduced the yield of small tubers (<85 g) and increased the proportion of larger tubers (170 to 340 g) compared with preplant application. Averaged across sites, KCl applied preplant or at hilling reduced specific gravity compared with the 0 KCl treatments. Improvements in fry colour with KCl application were evident at only one site. Petiole and tuber K and Cl− concentration, K and Cl− removal in harvested tubers, and post-harvest soil test K concentration increased with KCl application. However, petiole K concentration measured 82 to 85 d after planting predicted only 24% of the variability in relative marketable yield for sites containing between 164 and 632 mg NH4OAc-extractable K kg−1 to 15 cm. Results demonstrate the potential for yield increases and specific gravity declines with KCl application under Manitoba conditions, but suggest that further research will be required to better predict the potential for yield responses using soil and petiole testing.

scholarly journals The Influence of Various N-P-K Fertilizer Levels on Onion Production in Southern Puerto Rico.

1969 ◽  
Vol 63 (2) ◽  
pp. 111-115
Author(s):  
S. Alers-Alers ◽  
E. Orengo-Santiago ◽  
L. Cruz Pérez
Keyword(s):  
Puerto Rico ◽  
Coastal Plain ◽  
High Fertility ◽  
Long Period ◽  
Yield And Quality ◽  
Average Production ◽  
The World ◽  
K Fertilizer ◽  
Onion Cultivar

An experiment was conducted on a San Anton (Cumulic Hasplustolls) fine loamy mixed isohyperthermic in the southern irrigated coastal plain of Puerto Rico, to evaluate the influence of various N-P-K levels on yield and quality of onion (cultivar Texas Grano 502). All P and K fertilizer were broadcast and mixed with the soil at planting. Half of the N fertilizer was broadcast at planting and half was banded 6 weeks later between rows and left uncovered. Mean yield differences attributable to fertilizer levels were not significant. The soil seems to have sufficient available native N to meet this crop's needs. This may be in part attributable to continuous fertilizer applications over the years for sugarcane production in this soil. An average onion production of 22 metric tons/ha was obtained. The world average production is 11 metric tons/ha. Based on the results obtained, the production of onions in th is soil is recommended for two reasons: 1) The high tonnage that can be obtained, and 2) the low investment on fertilizers if planted on soils of high fertility, especially if previously used for sugarcane and fertilized over a long period.

scholarly journals Effect of Bio-Fertilizer and Foliar Spray of Selenium of Growth, Yield and Quality of Potato Plants

2020 ◽  
pp. 1-7
Author(s):  
Ramadan A. M. Aly ◽  
Khaled Y. Abdel-Halim
Keyword(s):  
Chlorophyll A ◽  
Vegetative Growth ◽  
Field Experiments ◽  
Foliar Spray ◽  
Growth Yield ◽  
High Rate ◽  
Positive Effects ◽  
Potato Plants ◽  
Yield And Quality

Two field experiments were conducted during two seasons of 2017 and 2018 to evaluate the effect of both bio-fertilizer (inoculated or uninoculated) and selenium (Se) spray at 0.5, and 10 ppm on vegetative growth, pigments, yield and quality of potato plants. The results indicated that, vegetative growth characters (number of leaves, plant height, plant fresh weight, plant dry weight, leaf area and leaf pigments (chlorophyll a, chlorophyll b and chlorophyll a and b were significantly increased with Bio-fertilizers (Halex-2, and High rate of Se (10 ppm), in both seasons. Plant yield of tuber, number of tubers/plant, average tuber weight and tuber yield/Fed and (tuber content of starch and protein), generally, seemed to be increased with the Bio-fertilizer (Halex-2) and high rate of Se, in both growing seasons. The interaction between Bio-fertilizer (Halex-2) and Se reflected positive effects on the all studied quantitative and qualitative characters of potato plants.

scholarly journals Potassium requirements and effects of K fertilizer application on yield and quality of bananas in Guangxi, China

Tropics ◽  
2006 ◽  
Vol 15 (1) ◽  
pp. 115-120
Author(s):  
Hongwei TAN ◽  
Liuqiang ZHOU ◽  
Rulin XAIE ◽  
Meifu HUANG
Keyword(s):  
Fertilizer Application ◽  
Yield And Quality ◽  
K Fertilizer
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