scholarly journals SOME NEW PAPAYA CVS FOR ST. CROIX U.S VIRGIN IS.

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 624d-624
Author(s):  
Chris Ramcharan ◽  
Paul Hepperly
Keyword(s):  
Soil Ph ◽  
Disease Incidence ◽  
High Ph ◽  
Low Input ◽  
Input System ◽  
Major Disease ◽  
High Soil ◽  
Ph Conditions

Twelve cvs. of Papaya were evaluated for yield and tolerance to drought, high soil pH and disease incidence under a non-pesticide low-input system. Superior yields were obtained from Barbados Solo (BDX 584-1) - 67.1 Kg/tree (tr) and 987 g/fruit (fr), Guanica (GU 2-1) - 60.7 Kg/tr and 888 g/fr, PR 6-65 × Cariflora (CF) - 46.6 Kg/tr and 700 g/fr, and CF - 48.5 Kg/tr and 607 g/fr. Most cvs. survived 19 months with peak yields at 15 months. Pencil top was major disease and only the Palau cv. exhibited St. Croix decline symptoms. Vigorous cvs. included GU 2-1, CF, PR 6-65 × CF and Criolla (CR) several plants of which are fruiting 26 months after planting. Chlorophyll data indicated that CF and CR cvs. had best tolerance to high pH conditions. Cvs. with large pulp size included GU 2-1 (3.7 cm) and SRS × CF (4.2). Brix analyses indicated sweetest fruits were from CF (14.2), SRS × CF (13.4), GU 2-1 (13.7) and PR 6-65 × CF (12.9).

scholarly journals 235 Evaluation of Southern Pea Cultivars and Breeding Lines for Earliness, Maturity, and Yield in Multiple-year Trials in South Texas

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 431E-431
Author(s):  
L. Brandenberger ◽  
R. Wiedenfeld ◽  
R. Mercado ◽  
J. Lopez ◽  
T.E. Morelock
Keyword(s):  
Soil Ph ◽  
Field Trials ◽  
South Texas ◽  
Breeding Lines ◽  
High Ph ◽  
Important Crop ◽  
High Soil ◽  
New Varieties ◽  
And Performance ◽  
High Yields

Southern peas for the processing market are an important crop for producers in South Texas, but little testing of new varieties or breeding lines has been carried out. Grower field trials during three different years and an on station trial provided an opportunity to evaluate >30 different pea cultivars or breeding lines. Cultivars and breeding lines were evaluated for earliness, maturity, yield, and performance in high-pH soils. Yields varied significantly each season, with Arkansas Blackeye # 1 providing consistently high yields in the three grower trials. Both Arkansas 87-435-68 and Texas Pinkeye produced significantly higher yields in the high soil pH trial at Weslaco. Yields for Arkansas 87-435-68 and Texas Pinkeye in the Weslaco trial were 1428 and 1231 lb of dry peas per acre, respectively.

scholarly journals Challenges of Strawberry Production in High-pH Soil at High Elevation in the Southwestern United States

HortScience ◽  
2015 ◽  
Vol 50 (2) ◽  
pp. 254-258 ◽  
Author(s):  
Shengrui Yao ◽  
Steve Guldan ◽  
Robert Flynn ◽  
Carlos Ochoa
Keyword(s):  
Soil Ph ◽  
Block Design ◽  
High Elevation ◽  
Science Center ◽  
High Ph ◽  
New Mexico State University ◽  
High Soil ◽  
Cultivar Selection ◽  
Leaf Chlorosis ◽  
Black Plastic

In 2011, 16 strawberry cultivars were planted with two planting systems—a black-plastic-covered perennial system (BP) and a matted-row system (MR)—arranged in a split-block design with four replications at the New Mexico State University (NMSU) Sustainable Agriculture Science Center, Alcalde, NM. Cultivars varied greatly in their yield and tolerance to high-pH soil. ‘Allstar’, ‘Chandler’, and ‘Darselect’ were the three most sensitive cultivars to high soil pH among the 16 cultivars tested, whereas ‘Wendy’, ‘Brunswick’, ‘Honeoye’, and ‘Clancy’ were the four most tolerant cultivars by the end of July 2011. Two to three applications of 0.67 g·m–1 (linear row) FeEDDHA were used per year through fertigation to effectively treat leaf chlorosis resulting from high soil pH. After averaging the yields of 2012 and 2013, ‘Mesabi’ and ‘Kent’ had greater yield than others and twice the yield of ‘Jewel’. Early cultivars Earliglow and Annapolis and late cultivars L’Amour and Ovation all had low yields in both years. In Jan. 2013, the minimum temperature reached –21.7 °C, which caused crown damage to some cold-tender cultivars, especially in the black-plastic-covered system. ‘Wendy’, ‘Chandler’, ‘Clancy’, and ‘Jewel’ were the cold-tender cultivars, whereas ‘Mesabi’, ‘Kent’, ‘Cavendish’, and ‘Honeoye’ were the hardiest among those tested. Despite repeated late frosts from 19 Apr. to 4 May 2013 and a delayed harvest season, most cultivars produced greater yield than in 2012 with ‘Mesabi’ and ‘Kent’ being the greatest. There were no significant differences in yields in 2012 and 2013 between BP and MR treatments, but yield in BP was significantly lower than in MR in 2014. With appropriate cultivar selection and management, growers can produce strawberries in high-pH soil at high elevation with a short growing season in the Southwest.

Effects of plastic mulch film residues on soil-microbe-plant systems under different soil pH conditions

Chemosphere ◽  
2020 ◽  
pp. 128901
Author(s):  
Yin Liu ◽  
Qing Huang ◽  
Wen Hu ◽  
Jiemin Qin ◽  
Yingrui Zheng ◽  
...  
Keyword(s):  
Soil Ph ◽  
Plastic Mulch ◽  
Soil Microbe ◽  
Mulch Film ◽  
Ph Conditions

Expression patterns of two carbonic anhydrase genes, Na+/K+-ATPase and V-type H+-ATPase, in the freshwater crayfish, Cherax quadricarinatus, exposed to low pH and high pH

2017 ◽  
Vol 65 (1) ◽  
pp. 50 ◽  
Author(s):  
Muhammad Yousuf Ali ◽  
Ana Pavasovic ◽  
Peter B. Mather ◽  
Peter J. Prentis
Keyword(s):  
Carbonic Anhydrase ◽  
Expression Patterns ◽  
Maximum Level ◽  
Low Ph ◽  
Freshwater Crayfish ◽  
Α Subunit ◽  
Cherax Quadricarinatus ◽  
High Ph ◽  
Internal Ph ◽  
Ph Conditions

Carbonic anhydrase (CA), Na+/K+-ATPase (NKA) and Vacuolar-type H+-ATPase (HAT) play vital roles in osmoregulation and pH balance in decapod crustaceans. As variable pH levels have a significant impact on the physiology of crustaceans, it is crucial to understand the mechanisms by which an animal maintains its internal pH. We examined expression patterns of cytoplasmic (CAc) and membrane-associated form (CAg) of CA, NKA α subunit and HAT subunit a in gills of freshwater crayfish, Cherax quadricarinatus, at three pH levels – 6.2, 7.2 (control) and 8.2 – over 24 h. Expression levels of CAc were significantly increased at low pH and decreased at high pH conditions 24 h after transfer. Expression increased at low pH after 12 h, and reached its maximum level by 24 h. CAg showed a significant increase in expression at 6 h after transfer at low pH. Expression of NKA significantly increased at 6 h after transfer to pH 6.2 and remained elevated for up to 24 h. Expression for HAT and NKA showed similar patterns, where expression significantly increased 6 h after transfer to low pH and remained significantly elevated throughout the experiment. Overall, CAc, CAg, NKA and HAT gene expression is induced at low pH conditions in freshwater crayfish.

scholarly journals Assessment of new low input vine systems: Dataset on environmental, soil, biodiversity, growth, yield, disease incidence, juice and wine quality, cost and social data.

Data in Brief ◽  
2020 ◽  
Vol 31 ◽  
pp. 105663 ◽  
Author(s):  
Marie Thiollet-Scholtus ◽  
Alix Muller ◽  
Céline Abidon ◽  
Julie Grignion ◽  
Olivier Keichinger ◽  
...  
Keyword(s):  
Disease Incidence ◽  
Growth Yield ◽  
Wine Quality ◽  
Soil Biodiversity ◽  
Quality Cost ◽  
Social Data ◽  
Low Input

scholarly journals Zinc availability for corn grown on an oxisol amended with flue dust

2006 ◽  
Vol 63 (6) ◽  
pp. 558-563 ◽  
Author(s):  
Gláucia Cecília Gabrielli dos Santos ◽  
Ronaldo Severiano Berton ◽  
Otávio Antônio de Camargo ◽  
Mônica Ferreira de Abreu
Keyword(s):  
Soil Ph ◽  
Agricultural Soils ◽  
Extraction Methods ◽  
Environmental Risks ◽  
Zinc Availability ◽  
Scheme Design ◽  
Flue Dust ◽  
Free Ion ◽  
Ph Conditions ◽  
Zn Availability

The costs related to the construction and maintenance of industrial landfills, and the environmental risks that they may represent, have increased the interest of several types of industries in studying the possibility of applying residues to agricultural soils. This study evaluates the efficiency of flue dust as a zinc source for corn, and the zinc availability for corn evaluated by four methods. A greenhouse experiment carried out at Campinas, SP, Brazil, evaluated the effect of two zinc sources (flue dust and zinc sulphate), at three rates (5, 50 and 150 mg dm-3), in one soil (Rhodic Hapludox) under two pH conditions (5.0 and 6.0). The treatments were arranged in a randomized factorial scheme design with three replications. Zinc availability indexes were determined by the pH 7.3 DTPA, Mehlich-1, and Mehlich-3 methods. The free Zn2+ activity in soil solution was calculated by the MINTEQ computer model. The extraction methods and the activity of the free ion Zn2+ were equally reliable to evaluate zinc availability in the soil amended with flue dust. More than 70% of the total Zn present in the saturation extract was in the free ion form, and the remainder was mainly complexed to SO4(2-) and OH-, independent of soil pH. Flue dust is a zinc supplier to plants. All tested methods were efficient in evaluating Zn availability for corn, independently of soil pH.

scholarly journals USE OF HYDROGEN PEROXIDE AND PERCARBONATE TO TREAT CHLORINATED AROMATIC HYDROCARBON-CONTAMINATED SOIL

2014 ◽  
Vol 22 (1) ◽  
pp. 30-39 ◽  
Author(s):  
Marika Viisimaa ◽  
Anna Goi
Keyword(s):  
Hydrogen Peroxide ◽  
Soil Ph ◽  
Liquid Hydrogen ◽  
Natural Soil ◽  
Contaminant Removal ◽  
Contaminant Degradation ◽  
Solid Carrier ◽  
Liquid Carrier ◽  
Initial Ph ◽  
Ph Conditions

This study compared treatment methods that utilised a liquid carrier of hydrogen peroxide and a solid carrier, percarbonate, for p-dichlorobenzene, p-chloro-m-cresol and p-chlorothymol degradation in the soil. The targeted chlorinated aromatic contaminants in the soil degraded to a certain level when treated with the liquid hydrogen peroxide, but the removal efficacy was not dependent on the dosage. In contrast, an increase in the percarbonate dosage enhanced the contaminant removal. Supplementary ferrous iron was more effective for the treatment that employed the liquid carrier of hydrogen peroxide than the treatment employing the solid carrier. Although acidic pH conditions (initial pH of 2.5) favoured contaminant degradation using liquid hydrogen peroxide, the treatment involving percarbonate resulted in more effective contaminant removal without any soil pH preadjustment. Therefore, the solid carrier of hydrogen peroxide, percarbonate, was concluded to be an effective alternative to the liquid carrier, resulting in greater contaminant removal at natural soil pH values.

Effect of Trifluralin and Metribuzin Combinations on Soybean Tolerance to Metribuzin

Weed Science ◽  
1977 ◽  
Vol 25 (1) ◽  
pp. 88-93 ◽  
Author(s):  
James S. Ladlie ◽  
William F. Meggitt ◽  
Donald Penner
Keyword(s):  
Glycine Max ◽  
Soil Ph ◽  
Root Development ◽  
Field Trials ◽  
Soybean Plant ◽  
Ph Values ◽  
High Soil

In field trials, soybeans [Glycine max(L.) Merr.] treated with trifluralin [α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine] at 0.56 and 0.84 kg/ha were protected from injury by metribuzin [4-amino-6-tert-butyl-3-(methylthio-as-triazine-5(4H)one] at 0.28 to 1.12 kg/ha. Soybean injury from metribuzin at high soil pH values was reduced by applying it in combination with trifluralin. Trifluralin also protected soybeans from injury caused by low rates of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] greenhouse studies. The trifluralin treatment reduced root development and greatly reduced14C-atrazine and14C-metribuzin uptake and content within the soybean plant.

scholarly journals The pH-based ecological coherence of active canonical methanotrophs in paddy soils

2020 ◽  
Vol 17 (6) ◽  
pp. 1451-1462 ◽  
Author(s):  
Jun Zhao ◽  
Yuanfeng Cai ◽  
Zhongjun Jia
Keyword(s):  
Soil Ph ◽  
Rice Paddy ◽  
Low Ph ◽  
Paddy Soils ◽  
Paddy Fields ◽  
Type I ◽  
Type Ii ◽  
High Ph ◽  
Niche Specialization ◽  
Rice Paddy Soils

Abstract. Soil pH is considered one of the main determinants of the assembly of globally distributed microorganisms that catalyze the biogeochemical cycles of carbon (C) and nitrogen (N). However, direct evidence for niche specialization of microorganisms in association with soil pH is still lacking. Using methane-oxidizing bacteria (methanotrophs) as a model system of C cycling, we show that pH is potentially the key driving force selecting for canonical γ (type I) and α (type II) methanotrophs in rice paddy soils. DNA-based stable isotope probing (DNA-SIP) was combined with high-throughput sequencing to reveal the taxonomic identities of active methanotrophs in physiochemically contrasting soils from six different paddy fields across China. Following microcosm incubation amended with 13CH4, methane was primarily consumed by Methylocystis-affiliated type II methanotrophs in soils with a relatively low pH (5.44–6.10), whereas Methylobacter- or Methylosarcina-affiliated type I methanotrophs dominated methane consumption in soils with a high pH (7.02–8.02). Consumption of 13CH4 contributed 0.203 % to 1.25 % of soil organic C, but no significant difference was observed between high-pH and low-pH soils. The fertilization of ammonium nitrate resulted in no significant changes in the compositions of 13C-labeled methanotrophs in the soils, although significant inhibition of methane oxidation activity was consistently observed in low-pH soils. Mantel analysis further validated that soil pH, rather than other parameters tested, had significant correlation to the variation in active methanotrophic compositions across different rice paddy soils. These results suggest that soil pH might have played a pivotal role in mediating the niche differentiation of ecologically important aerobic methanotrophs in terrestrial ecosystems and imply the importance of such niche specialization in regulating methane emissions in paddy fields following increasingly intensified input of anthropogenic N fertilizers.

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