scholarly journals Screening of the Optimal Potassium Fertilization Rate for Maximizing Bulb Yield and Potassium Nutrient Evaluation in Fritillaria thunbergii Miq.

2021 ◽  
Vol 1 (1) ◽  
pp. 100003
Author(s):  
Leran Wang ◽  
Jingyi Sun ◽  
Guoyin Kai ◽  
Ning Sui
Keyword(s):  
Fertilization Rate ◽  
Potassium Fertilization ◽  
Bulb Yield

scholarly journals Nitrogen and potassium fertilization of potato

1978 ◽  
Vol 50 (2) ◽  
pp. 67-77
Author(s):  
Hilkka Tähtinen
Keyword(s):  
Nitrogen Fertilization ◽  
Starch Content ◽  
Fertilization Rate ◽  
Application Rate ◽  
Potassium Fertilization ◽  
Mineral Soils ◽  
One Year ◽  
Starch Yield ◽  
Nitrogen Application Rate

Fourteen one-year N- and K-fertilization experiments for potato were carried out on coarse mineral soils on different sites in Finland. The nitrogen fertilization (from 50 to 156 kg/ha N) was given in the form of ammonium nitrate limestone, and the potassium (42—179 kg/ha K) in potassium sulphate. The nitrogen fertilization affected significantly both the yield and the quality of the tubers. The maximum tuber yield was achieved at the nitrogen application rate of 110 kg/ha. The economically most advantageous fertilization rate was 80 kg of nitrogen per hectare, if only the amount of the yield was taken into account. The nitrogen fertilization weakened the quality of the tubers. The weight and the size of the tubers increased, but the starch content of the tubers decreased as a result of the nitrogen fertilization. The starch yield also turned out to be the smallest at the heaviest nitrogen fertilization. Further, the biggest rate of nitrogen weakened the flavor of the tubers, depressed their mealiness, and increased slightly their discoloration when raw. The fertilization had no effect on the darkening of cooked potatoes. In these one-year experiments, the increase of the potassium fertilization from 42 kg/ha K did not have a significant effect on the yield and the quality of the tubers.

scholarly journals Effect of Pinching Date and Potassium Fertilizer rate on Growth and Productivity of Roselle (Hibiscus sabdariffa, L.) Plant

2021 ◽  
pp. 18-27
Author(s):  
Nahed S. A. El-Shayeb ◽  
Naglaa F. S. I. Elbohy ◽  
Mohammed A. I. Abdelkader
Keyword(s):  
Field Experiments ◽  
Chemical Constituents ◽  
Growth Yield ◽  
Sowing Date ◽  
Fertilization Rate ◽  
The Other ◽  
Control Treatment ◽  
Anthocyanin Content ◽  
Potassium Fertilizer ◽  
Potassium Fertilization

To enhance growth and productivity of roselle plant, two field experiments were done during the two consecutive summer season of 2019 and 2020 at Experimental Farm (Ghazala Farm), Faculty of Agriculture, Zagazig University, Egypt. This study included different pinching time treatments (after 4, 6, 8 and 12 weeks from sowing date) as the main factor and potassium fertilization rate (0.0, 25, 50 and 75 kg K2O/ feddan) as sub-factor as well as their combinations to improve growth, yield, anthocyanin content and some chemical contents of Hibiscus sabbdariffa plant. Results could be summarized as follow: The longest roselle plants were recorded with the control treatment (pinched after 4 weeks from sowing date), whereas pinching after 12 weeks from sowing date increased number of branches/plant. Also, apical bud pinching after 12 weeks from sowing date recorded the highest number of fruits per plant, dry sepals yield/plant and per feddan. Delaying pinching date from 4 to 8 weeks gradually increased anthocyanin content. In addition, total chlorophyll content as well as total carbohydrates, total nitrogen, total phosphorus and potassium percentages were increased with delaying pinching date especially after 12 weeks, in most cases. Potassium fertilization rate at 75 kg per feddan recorded the highest values of growth, yield components and the chemical constituents with significant differences between this rate and the other rates under study. Generally, the combination treatment between pinching after 12 weeks from sowing date and 75 kg potassium fertilization rate had significant effect in most parameters compared to the other combination treatments during both seasons.

scholarly journals Sweet Onion (Allium cepa L.) as Influenced by Organic Fertilization Rate: 2. Bulb Yield and Quality before and after Storage

HortScience ◽  
2018 ◽  
Vol 53 (4) ◽  
pp. 459-464
Author(s):  
Juan Carlos Díaz-Pérez ◽  
Jesús Bautista ◽  
Gunawati Gunawan ◽  
Anthony Bateman ◽  
Cliff Martin Riner
Keyword(s):  
Organic Fertilizer ◽  
Dry Weight ◽  
Fertilization Rate ◽  
Organic Fertilizers ◽  
Soluble Solids ◽  
Onion Bulb ◽  
Organic Fertilization ◽  
Yield And Quality ◽  
Before And After ◽  
Bulb Yield

There is a growing interest in organic fertilizers because of increased demand for organic sweet onions and other vegetables. There are, however, limited studies on sweet onion bulb yield and quality in response to organic fertilization. The objective of this study was to evaluate the effects of organic fertilizer rate on sweet onion bulb yield and bulb quality before and after storage. Experiments were conducted at the Horticulture Farm, Tifton Campus, University of Georgia, in the Winters of 2012–13 and 2013–14. There were five organic fertilization treatments (organic fertilizer 3–2–3 equivalent to 0, 60, 120, 180, and 240 kg·ha−1 N). Total and marketable yields and individual bulb weight increased quadratically with increasing organic fertilization rate and responses failed to reach a plateau. The fraction of extra-large bulb increased with increasing organic fertilization rate. Incidence of onion bolting was maximal at 60 kg·ha−1 N and decreased with increasing organic fertilization rate. The percentage of bulb dry weight was highest in the unfertilized control and decreased with increasing organic fertilization rate. Organic fertilization rate had no consistent impact on bulb soluble solids content (SCC) and pungency (measured as pyruvate concentration) in the two seasons. Total antioxidant capacity (measured as gallic acid equivalents) values were among the lowest at 60 and 120 kg·ha−1 N. In conclusion, onion bulb yields increased with increasing organic fertilization rate, whereas incidences of bulb diseases responded differently to N rate. Botrytis rot was the main cause of postharvest bulb decay in all organic fertilization rates.

scholarly journals Effect of Potassium Level on Severity of Drechslera Leaf Spot of Calathea picturata ‘Vandenheckei’

1991 ◽  
Vol 9 (2) ◽  
pp. 101-102
Author(s):  
A.R. Chase ◽  
T.K. Broschat
Keyword(s):  
Electrical Conductivity ◽  
Leaf Spot ◽  
Potassium Level ◽  
Fertilization Rate ◽  
Test Period ◽  
Plant Quality ◽  
Potassium Fertilization ◽  
Number Of Leaves

Abstract Severity of Drechslera leaf spot (Drechslera setariae) of Calathea picturata ‘Vandenheckei’ was affected by potassium fertilization rate with ½, 1 or 2 times the recommended rate (1400 g/m3) causing a reduction in number of lesions caused by Drechslera setariae compared to plants receiving no potassium. In addition, plant quality, height and number of leaves were unaffected by potassium rate during the test period. Leachate electrical conductivity was unaffected by these potassium rates and was approximately 1000 μhos/cm two months after fertilization.

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