The effect of soil pH on copper toxicity to forage maize grown under field conditions.

Cu toxicity to forage maize was studied in a factorial field experiment comprising 4 Cu rates (0, 100, 200 or 300 kg Cu/ha) and 4 pH levels. Results are presented for crop yield and mineral composition. Raising the soil pH reduced the toxic effect of Cu to a smaller extent than would be predicted from the reduction in the Cu2+ ion activity. Apparently an increase in pH increased the toxicity of Cu2+ ions in sol. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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The effect of pH on copper toxicity to hydroponically grown maize.

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v29i3.17008 ◽

1981 ◽

Vol 29 (3) ◽

pp. 217-238 ◽

Cited By ~ 6

Author(s):

T.M. Lexmond ◽

P.D.J. van der Vorm

Keyword(s):

Root Growth ◽

Toxic Effect ◽

Copper Toxicity ◽

Effect Of Ph ◽

Cu Toxicity ◽

Hydroponically Grown

The effect of pH on Cu toxicity in maize cv. Capella was studied in 3 sol. culture experiments of different design. Raising the pH intensified the toxic effect of Cu which reduced root growth and enhanced association of Cu2+ ions with physiologically essential sites in the roots when competition from protons was lowered. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Evaluation of Imazethapyr for Weed Control in Leafy Vegetable Crops

Weed Technology ◽

10.1017/s0890037x00039907 ◽

1996 ◽

Vol 10 (2) ◽

pp. 253-257 ◽

Cited By ~ 4

Author(s):

Joan A. Dusky ◽

William M. Stall

Keyword(s):

Regression Analysis ◽

Weed Control ◽

Crop Yield ◽

Relative Sensitivity ◽

Leafy Vegetable ◽

Field Conditions ◽

Vegetable Crops ◽

Weed Species ◽

Common Lambsquarters ◽

Common Purslane

Imazethapyr was evaluated PRE and POST in five lettuce types and chicory under Florida field conditions. The relative sensitivity of leafy crop vigor (most sensitive to most tolerant) to imazethapyr PRE, based on 20% inhibition determined using regression analysis, was as follows: Boston > bibb > crisphead > romaine > leaf > escarole > endive. Leafy crop injury increased as the rate of imazethapyr applied POST increased, with all leafy crops responding in a similar manner. Surfactant addition increased imazethapyr phytotoxicity. Imazethapyr PRE treatments at 0.067 kg ai/ha provided greater than 80% control of livid amaranth, common purslane, flatsedge, and common lambsquarters. Imazethapyr POST at 0.067 kg/ha, with surfactant provided control greater than 85% of all weed species. Greater than 85% spiny amaranth control was provided by imazethapyr POST at 0.017 kg/ha. Use of surfactant with imazethapyr did not improve spiny amaranth control over imazethapyr with no surfactant. POST treatments did not decrease leafy crop yield compared with the hand-weeded check. Imazethapyr applied PRE reduced crop yield compared to the POST treatments and the hand-weeded control.

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Exploring the Vis-NIR wavelength importance in SOC models under field and lab conditions in a long-term field experiment

10.5194/egusphere-egu21-12713 ◽

2021 ◽

Author(s):

Javier Reyes ◽

Mareike Ließ

Keyword(s):

Field Experiment ◽

Spectral Response ◽

Nir Spectroscopy ◽

Partial Least Square ◽

Least Square ◽

Field Conditions ◽

Partial Least Square Regression ◽

Preprocessing Technique ◽

Term Field

<p>Soil organic carbon (SOC) is of particular interest in the study of agricultural systems as an indicator of soil quality and soil fertility. In the use of Vis-NIR spectroscopy for SOC detection, the interpretation of the spectral response with regards to the importance of individual wavelengths is challenging due to the soil&#8217;s composition of multiple organic and minerals compounds. Under field conditions, additional aspects affect the spectral data compared to lab conditions. This study compared the spectral wavelength importance in partial least square regression (PLSR) models for SOC between field and lab conditions. Surface soil samples were obtained from a long-term field experiment (LTE) with high SOC variability located in the state of Saxony-Anhalt, Germany. Data sets of Vis-NIR spectra were acquired in the lab and field using two spectrometers, respectively. Four different preprocessing methods were applied before building the models. Wavelength importance was observed using variable importance in projection. Differences in wavelength importance were observed depending on the measurement device, measurement condition, and preprocessing technique, although pattern matches were identifiable, especially in the NIR range. It is these pattern matches that aid model interpretation to effectively determine SOC under field conditions.</p>

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Effect of flooding on growth and yield of mungbean genotypes

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v41i1.27680 ◽

2016 ◽

Vol 41 (1) ◽

pp. 151-162 ◽

Cited By ~ 1

Author(s):

MR Amin ◽

MA Karim ◽

MR Islam ◽

S Aktar ◽

MA Hossain

Keyword(s):

Field Experiment ◽

Seed Size ◽

Seed Yield ◽

Field Conditions ◽

Growth And Yield ◽

Yield Reduction ◽

Plant Seed ◽

Days To Flowering ◽

Soil Flooding ◽

Standing Water

The field experiment was carried out with some selected mungbean genotypes viz. IPSA-13, VC-6173A, BU mug 2, BARI Mung-5 and IPSA-12 to observe the effect of 4-days flooding on their growth and yield of mungbean under field conditions at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during September to November, 2011 maintaining 3-5 cm standing water at 24 days after emergence. Days to flowering and maturity delayed in flooded plants over control depending on the genotypes. Flooding significantly reduced Total Day Matters (TDM), number of pods per plant, seed size and seed yield of the mungbean genotypes over control. Considering higher seed yield, larger seed size and less yield reduction relative to control VC-6173A, BU mug 2 and IPSA-13 were found tolerant to soil flooding condition.Bangladesh J. Agril. Res. 41(1): 151-162, March 2016

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Citrus Soil pH Testing Procedures

EDIS ◽

10.32473/edis-ss665-2019 ◽

2019 ◽

Vol 2019 (6) ◽

pp. 2

Author(s):

Kelly Morgan

Keyword(s):

Plant Growth ◽

Crop Yield ◽

Soil Ph ◽

Testing Procedures ◽

Soil And Water

Maintaining the correct soil pH is essential to ensure optimal plant growth and crop yield. This new two-page document is an instructional sheet for citrus soil pH testing, written by Kelly Morgan and published by the UF/IFAS Department of Soil and Water Sciences.https://edis.ifas.ufl.edu/ss665

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Efficacy of Fungicides Against Grain Discoloration Disease of Rice

International Journal of Economic Plants ◽

10.23910/2/2020.0367 ◽

2020 ◽

Vol 7 (2) ◽

pp. 073-076

Author(s):

V. A. Patil ◽

◽

P. B. Patel ◽

P. D. Ghoghari ◽

N. K. Kavad ◽

...

Keyword(s):

Oryza Sativa ◽

Field Experiment ◽

Oryza Sativa L ◽

Fungal Disease ◽

Field Conditions ◽

Maturity Stage ◽

Rice Grain ◽

New Combinations ◽

Cereal Crop

Rice (Oryza sativa L.) is one of the important cereal crop grown extensively in Gujarat. It suffers from grain discoloration fungal disease causing heavy losses at maturity stage of rice. A field experiment was laid out with the single and new combinations fungicides against rice grain discoloration disease under field conditions during kharif-2013-14, 2014-15 and 2015-16. Six fungicides at various concentrations were screened against rice grain discoloration disease. The trifloxystrobin 25% + tebuconazole 50% (0.03 %) @ 0.4 g l-1 and propiconazole 25 EC (0.025 %) @ 1.0 ml l-1 was found effective against rice grain discoloration and recorded significantly higher healthy grains.

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Capacity of earwig Marava arachidis (Yersin) to access fennel plants Foeniculum vulgare Mill in laboratory and field

Ciência Rural ◽

10.1590/s0103-84782007000600003 ◽

2007 ◽

Vol 37 (6) ◽

pp. 1524-1528 ◽

Cited By ~ 4

Author(s):

Charles Ira Abramson ◽

Paulo Alves Wanderley ◽

Alexandre José Soares Miná ◽

Maria José Araújo Wanderley

Keyword(s):

Essential Oil ◽

Field Experiment ◽

Field Conditions ◽

Foeniculum Vulgare ◽

Independent Variables ◽

Laboratory Conditions ◽

Potential Capacity ◽

Males And Females

This research was aimed at obtaining data about earwig behavior (Marava arachidis Y.) on fennel agro-ecosystems and evaluating its potential capacity to access plants in the absence of aphids under laboratory and field conditions. This study establishes a baseline to evaluate earwigs as biological controls to combat aphids that attack fennel plants. Two experiments were developed. In experiment 1, earwigs were studied under laboratory conditions, in experiment 2 under field conditions. Independent variables were sex, exposure to the essential oil of fennel for 24 or 48 hours, and whether the fennel plant was vegetative or flowering. The results indicated that earwigs will climb a fennel plant in the absence of aphids and that few statistical significant results were obtained among the independent variables examined. A difference between male and females was noted in the field experiment in animals receiving 48 h of exposure to the essential oil of fennel. The terminal height reached by males and females in the 48 h vegetative and flower condition also differed.

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