scholarly journals Fertilization management strategies for ‘Agata’ potato production

2021 ◽  
Vol 39 (4) ◽  
pp. 389-396
Author(s):  
Rogério P Soratto ◽  
Renato Yagi ◽  
André Luiz G Job ◽  
Adalton M Fernandes
Keyword(s):  
Management Strategies ◽  
Potato Cultivar ◽  
Potato Production ◽  
Production Costs ◽  
Monoammonium Phosphate ◽  
Environmental Liabilities ◽  
P Concentration ◽  
P Rate ◽  
Standard Rate ◽  
Leaf P

ABSTRACT Fluctuations in potato prices and invariably rising production costs need sustainable fertilization strategies. For this purpose, two experiments were conducted in the southwestern region of São Paulo state to evaluate fertilization management strategies for the ‘Agata’ potato cultivar. The treatments consisted of the producer’s standard fertilization (1700 kg ha-1 NPK 4-30-10 at planting + 100 kg ha-1 urea and 150 kg ha-1 KCl at hilling) and combinations of two P rates at planting (standard rate and half of the rate), as monoammonium phosphate (MAP) with two forms of KCl application (total rate in the post-planting phase or half of the rate in the post-planting phase and half at hilling). The application of half the P rate (255 kg ha-1 P2O5) as the MAP at planting and the transfer of K from planting to applications in the post-planting phase or in the post-planting phase and at hilling, despite having provided a lower leaf P concentration, maintained the total tuber yield with higher operational yield of planting fertilization. It also increased the yield of tubers with a diameter >4.5 cm under conditions of lower water availability in the vegetative stages of the crop and soil with medium availability of P and K. Such a fertilization strategy is valuable for cost reductions and possible environmental liabilities.

scholarly journals Flowering of Apple Trees in the Second Year Is Increased by Firstyear P Fertilization

HortScience ◽  
1990 ◽  
Vol 25 (10) ◽  
pp. 1247-1250 ◽  
Author(s):  
G.H. Neilsen ◽  
E.J. Hogue ◽  
P. Parchomchuk
Keyword(s):  
Malus Domestica ◽  
Irrigation Water ◽  
Fruit Set ◽  
Ammonium Polyphosphate ◽  
P Fertilization ◽  
Monoammonium Phosphate ◽  
Apple Trees ◽  
P Concentration ◽  
Second Year ◽  
Leaf P

Application of high rates of P in the year of planting increased the number of flower clusters and fruit set the subsequent year on newly planted `Macspur McIntosh', `Summerland Red McIntosh', `Jonagold', and `Jonamac' apple (Malus domestica Borkh.) on dwarfing rootstock (M.26 and M.9) in three separate experiments. The effect occurred whether P was applied at rates of 36 or 48 g P/tree as granular monoammonium phosphate (11 N-23.6 P-0K) uniformly mixed with 100 or 180 liter of soil in the planting hole or at rates of 17.5 and 35 g P applied as soluble ammonium polyphosphate (10N-14.6P-0K) with the irrigation water. A leaf P concentration range between 0.20% and 0.36% was associated with the acceleration of fruiting.

scholarly journals Biological control agents in the integrated nematode management of potato in Egypt

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Mahfouz M. M. Abd-Elgawad
Keyword(s):  
Biological Control ◽  
Crop Yields ◽  
Integrated Management ◽  
Management Strategies ◽  
Economic Value ◽  
Potato Production ◽  
Parasitic Nematodes ◽  
Main Body ◽  
Biological Control Agents ◽  
Economic Significance

Abstract Background Potato represents Egypt’s largest vegetable export crop. Many plant-parasitic nematodes (PPNs) are globally inflicting damage to potato plants. In Egypt, their economic significance considerably varies according to PPN distribution, population levels, and pathogenicity. Main body This review article highlights the biology, ecology, and economic value of the PPN control viewpoint. The integration of biological control agents (BCAs), as sound and safe potato production practice, with other phytosanitary measures to manage PPNs is presented for sustainable agriculture. A few cases of BCA integration with such other options as synergistic/additive PPN management measures to upgrade crop yields are reviewed. Yet, various attributes of BCAs should better be grasped so that they can fit in at the emerging and/or existing integrated management strategies of potato pests. Conclusion A few inexpensive biocontrol products, for PPNs control on potato, versus their corresponding costly chemical nematicides are gathered and listed for consideration. Hence, raising awareness of farmers for making these biologicals familiar and easy to use will promote their wider application while offering safe and increased potato yield.

On-farm Development of Potato Production from True Seed in Indonesia

1992 ◽  
Vol 28 (1) ◽  
pp. 31-39 ◽  
Author(s):  
N. Gunadi ◽  
M. J. Potts ◽  
R. Sinung-Basuki ◽  
Greta A. Watson
Keyword(s):  
Production Systems ◽  
Potato Production ◽  
Production Costs ◽  
Potato Seed ◽  
True Potato Seed ◽  
Yield Difference ◽  
Tuber Crop ◽  
On Farm ◽  
Comparable Quality ◽  
Better Than

SummaryThree seasons of on-farm experimentation to develop potato production from botanical or true potato seed (TPS) under cool fertile conditions in West Java, Indonesia, are described. Twenty-three farmers experimented with two production systems: use of transplants, and use of seedling tubers produced in nursery beds. There was little yield difference between the systems, but an apparent progeny × system × season interaction was observed. All progenies were more resistant to late blight than the present cultivars grown from tubers. Appropriate matching of progeny and system gave seed of comparable quality with, but total yields slightly less than, certified imported seed of cv. Granola. Ware quality was slightly better than that of cv. Granola. Production costs were markedly less than for a tuber crop, making TPS ideal for small, resource-poor farmers.

scholarly journals The Improvement of Mini Tuber Production of Granola Potato Cultivar in Aeroponics System

2021 ◽  
Vol 13 (1) ◽  
pp. 77-83
Author(s):  
Sugiyono Sugiyono ◽  
Lucky Prayoga ◽  
Elly Proklamasiningsih ◽  
Khavid Faozi ◽  
Rendie Prasetyo
Keyword(s):  
Potato Cultivar ◽  
Potato Production ◽  
Tuber Formation ◽  
Planting Density ◽  
Food Crop ◽  
Important Food ◽  
High Quality ◽  
Plant Materials ◽  
Tuber Production ◽  
Surrounding Areas

Potato is an important food crop in both developed and developing countries and it is the fourth most important food crop after wheat, maize, and rice. Potato production in Indonesia has decreased in recent years, mainly due to the use of low quality tuber seed. The objective of this research was to determine the effect of plant materials, types of nutrients, and planting density on mini tuber formation, as well as to determine the best aeroponics conditions for mini tuber formation of Granola cultivar of potato. This research has been carried out experimentally using a Split-split Plot Design. The main plot was planting materials which consisted of plantlet and knol. The subplot was the type of nutrition media which consisted of Farran nutrition, Otazu nutrition, and AB-commercial mix. The sub-sub-plot was planting density which consisted of 50, 75, and 100 plants/m2. The research results showed that knol planted in aeroponics system on AB-commercial mix at a planting density of 75 plants/m2 resulted in the best mini-tuber production. In this study, for the first time three important factors for potato mini-tuber production have thoroughly been investigated in Indonesia. This finding will be used by Kledung Horticultural Seed Garden, Temanggung, for mass production of high-quality mini-tuber seed, which in turn will provide sufficient tuber seed for the farmer in its surrounding areas. By increasing the production of high-quality tuber seed, it is expected that it will contribute to the improvement of potato productivity and increase Indonesian potato production.

scholarly journals KERAGAAN PRODUKSI DAN HARGA KENTANG DI KECAMATAN PANGALENGAN, KABUPATEN BANDUNG

2020 ◽  
Vol 6 (1) ◽  
pp. 265
Author(s):  
Salma Aulia Rahmah ◽  
Eliana Wulandari
Keyword(s):  
Food Security ◽  
Secondary Data ◽  
Potato Production ◽  
Economic Benefits ◽  
Production Costs ◽  
Macro Level ◽  
Average Price ◽  
Average Amount

Agriculture has an important role in food security in Indonesia from micro to macro level. One of the agricultural subsectors is horticulture particularly in potato that can support food diversification programs in Indonesia. The problem that occurs in horticultural commodities is the fluctuating selling prices that affect the economic benefits received by business actors. This study aims to analyze the revenue of potato farmers from 2016 to 2018. The research was conducted in Pangalengan Sub District by including 52 potato farmers. The data in this study used both primary and secondary data, which were then analyzed quantitatively. The results of the study showed that the average amount of potato production in 2016 to 2018 in Pangalengan Sub District was 17.27 tons per hectare, while the average price of potatos in the last three years was Rp. 7,640 per kg. Based on the results of the study, the average of potato revenues in 2016 - 2018 is Rp. 131.946.193 per hectare. Revenue of potato farmers in Pangalengan Sub District is quite large, thus potato farmers have the potential to earn large profits if they can reduce production costs.

scholarly journals Anastomosis Grouping of Rhizoctonia solani Associated with Black Scurf and Stem Canker of Potato in South Africa

Plant Disease ◽  
2004 ◽  
Vol 88 (1) ◽  
pp. 83-83 ◽  
Author(s):  
M. Truter ◽  
F. C. Wehner
Keyword(s):  
South Africa ◽  
Rhizoctonia Solani ◽  
Rating Scale ◽  
Solanum Tuberosum L ◽  
Potato Cultivar ◽  
Stem Canker ◽  
Potato Production ◽  
Black Scurf ◽  
Chi Square ◽  
Chi Square Analysis

Rhizoctonia disease (black scurf of tubers and stem canker) of potato (Solanum tuberosum L.) caused by Rhizoctonia solani Kühn was first recorded in South Africa in 1918 (3). Although the sclerotial form on tubers is one of the most common potato diseases in the country, it is not known which anastomosis groups (AGs) of R. solani are involved. Between 1999 and 2001, R. solani was isolated from 28 plant and 56 soil samples collected in 7 (Eastern Free State, Gauteng, KwaZulu-Natal, Limpopo, Mpumalanga, Northern Cape, and Sandveld) of the 14 potato-production regions of South Africa and screened for hyphal anastomosis with tester strains of R. solani AG-1 to AG-10 according to Carling et al. (1). Of the 411 isolates from tubers with black scurf symptoms, 408 were AG-3 and three were AG-5. Symptomless tubers yielded two AG-3 isolates and three AG-5 isolates. Of 39 isolates from symptomatic stems and roots, 32 were AG-3, five were AG-4, and two were AG-5. Of the 127 isolates obtained from soil, 86, 28, 7, 3, and 3 were AG-3, AG-4, AG-5, AG-7, and AG-8, respectively. More than one AG was isolated from five of the seven regions. Virulence of 40 isolates representative of the above AGs was determined in triplicate on sprouts growing from seed tubers of potato cultivar Up-to-Date in a sand/soil mixture as described by Carling and Leiner (2) but using cultures grown in cornmeal/sand instead of colonized agar disks as inoculum. Damage to sprouts (lesions, girdling, and death) was assessed after 28 days at 16 to 28°C according to the 0 to 4 rating scale (2). Chi-square analysis of the data indicated that AG-3 was the most virulent, with isolates from sclerotia on tubers and lesions on stems more aggressive than those from symptomless tubers or soil. AG-4 and AG-5 caused significantly less disease than AG-3, but none of the AG-7 and AG-8 isolates showed any virulence to potato sprouts. References: (1) D. E. Carling et al. Phytopathology 77:1609, 1987. (2) D. E. Carling and R. H. Leiner. Phytopathology 80:930, 1990. (3) E. M. Doidge. S. Afr. Fruit Growers 5:6, 1918.

Phosphorus Management Strategies for Potato Production in Florida: a Review

2021 ◽  
Author(s):  
Joris Van Zeghbroeck ◽  
Guodong Liu ◽  
Rao S. Mylavarapu ◽  
Yuncong C. Li
Keyword(s):  
Management Strategies ◽  
Potato Production

Valuing feedback mechanisms between water and energy systems in hydropower networks

2021 ◽  
Author(s):  
Rachel Koh ◽  
Jordan Kern ◽  
AFM Kamal Chowdhury ◽  
Stefano Galelli
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Renewable Energy Sources ◽  
Management Strategies ◽  
Energy System ◽  
Water Systems ◽  
Feedback Mechanism ◽  
Production Costs ◽  
Feedback Mechanisms ◽  
Modelling Framework

<p>Multi-sector modelling frameworks are fundamental platforms for exploring the complex interactions between the water and energy sectors. While acknowledging the pivotal role of hydropower within the energy system, it is essential to understand the feedback mechanisms between power and water systems to guide the design of hydropower operations and enhance water-energy management strategies. With this in mind, we developed a modelling framework hinged on a bidirectional coupling between water and power system models. We simulate the constraints imposed by water availability on grid operations as well as the feedback between the state of the energy and water systems. For example, the framework explicitly accounts for conditions of hydropower oversupply, during which part of the water could be stored in reservoirs or allocated to other sectors. The flexibility added to the system gives operators control over desired reservoirs, and allows the system to exploit the benefits warranted by a more efficient use of renewable energy. We evaluate the framework on a real-world case study based on the Cambodian grid, which relies on hydro, solar, and thermoelectric resources. In our analysis, we demonstrate that managing hydropower reservoirs with the feedback mechanism in mind allows us to improve system’s performance—evaluated in terms of power production costs and CO<sub>2</sub> emissions. Overall, our work contributes a novel modelling tool for climate-water-energy nexus studies, working towards an optimal integration of hydropower and other renewable energy sources into power systems.</p>

A simple, low-cost technique for in situ measurement of leaf P concentration in field-grown rice

2018 ◽  
Vol 182 (1) ◽  
pp. 28-30
Author(s):  
Koji Yamane ◽  
Ranee C. Mabesa-Telosa ◽  
Ryosuke Tajima ◽  
Nino P. M. C. Banayo ◽  
Yoichiro Kato
Keyword(s):  
Low Cost ◽  
In Situ Measurement ◽  
P Concentration ◽  
Leaf P

Population decline of Globodera rostochiensis in Western Serbia

Nematology ◽  
2017 ◽  
Vol 19 (2) ◽  
pp. 185-195
Author(s):  
Nikola Grujić ◽  
Milan Radivojević
Keyword(s):  
Climatic Factors ◽  
Population Decline ◽  
Potato Cultivar ◽  
Potato Production ◽  
Globodera Rostochiensis ◽  
Initial Population ◽  
Management Procedures ◽  
Before And After ◽  
New Generation ◽  
Annual Decline

Annual decline rates of potato cyst nematode (PCN) populations have been extensively studied. They vary considerably due to many factors, including potato cultivar, initial PCN density and climatic factors. Information is needed on PCN decline in potato fields in the specific conditions of Western Serbia, which is the centre for most of the local potato production, especially seed potato. We investigated the decline of Globodera rostochiensis over 1 or 2 years under the influence of PCN-resistant potato cv. Agria in the field and microplots. Decline was compared with fallow in Ponikve, near the original record of G. rostochiensis. Population decline in the field after cv. Agria was approximately 80%. In two parts of the field where potato cv. Agria was cropped once or twice with fallow before and after, the viable PCN population declined over 9 years to about 1% of initial values. In a third part of the field, left fallow for 9 years, 15% of the initial population was still viable, after an annual decline rate of 9.4%. The influence of volunteer potatoes on maintaining PCN populations was also examined. In the microplots, with a higher density of volunteers compared to the field, PCN decline under resistant potato cv. Agria was 70%. At crop harvest a new generation was recorded, suggesting its possible formation on susceptible volunteer potato. The full cysts represented 1% of all cysts examined and 13% of total second-stage juveniles found in the samples. The information will be useful for improvement of management procedures.

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