An attachment to a tractor-mounted seed-spacing drill for applying granular formulations to small field-plots

1983 ◽  
Vol 102 (3) ◽  
pp. 511-521 ◽  
Author(s):  
A. R. THOMPSON ◽  
A. L. PERCIVALL ◽  
G. H. EDMONDS ◽  
G. R. LICKORISH
Keyword(s):  
Small Field ◽  
Seed Spacing ◽  
Field Plots

Automated Spray System for Application of Solutes to Small Field Plots

1990 ◽  
Vol 54 (1) ◽  
pp. 287-290 ◽  
Author(s):  
Masoud Ghodrati ◽  
Frederick F. Ernst ◽  
William A. Jury
Keyword(s):  
Small Field ◽  
Spray System ◽  
Field Plots ◽  
Automated Spray System

scholarly journals Composition at Different Development Stages of the Essential Oil of Four Achillea Species Grown in Iran

2010 ◽  
Vol 5 (2) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Majid Azizi ◽  
Remigius Chizzola ◽  
Askar Ghani ◽  
Fatemeh Oroojalian
Keyword(s):  
Essential Oil ◽  
Volatile Compounds ◽  
Developmental Stages ◽  
Small Field ◽  
Late Flowering ◽  
Main Compound ◽  
Development Stages ◽  
Full Flowering ◽  
Field Plots

Four Achillea species, A. millefolium, A. nobilis, A. eriophora and A. biebersteinii, were grown in small field plots in Iran and harvested at four developmental stages: vegetative, at the appearance of the first flower heads, at full flowering, and at late flowering. The composition of the main volatile compounds in dichloromethane extracts and the essential oil obtained by microdistillation was established by GC/MS and GC. 1,8-Cineole (27-41%) was the main compound in the oils from A. millefolium and A. biebersteinii. These two species reached the highest amount of volatile compounds at the full blooming stage. α-Thujone was the main compound in A. nobilis oil (25-64%). Fully blooming plants of this species also had a high proportion of artemisia ketone (up to 40%) in the oil. The main oil compounds of A. eriophora were camphor (about 35%) and 1,8-cineol (about 30%). This species produces only a small number of flower heads and the composition of the essential oil did not change during development.

PERSISTENCE OF LINURON IN SASKATCHEWAN SOILS

1975 ◽  
Vol 55 (2) ◽  
pp. 145-148 ◽  
Author(s):  
A. E. SMITH ◽  
G. S. EMMOND
Keyword(s):  
Field Conditions ◽  
Soil Types ◽  
Small Field ◽  
Herbicide Treatment ◽  
Field Plots ◽  
Made In

The persistence of linuron, at rates equivalent to 2.2 kg/ha, was studied at four sites in Saskatchewan using small field plots. Following applications made in May 1972, plots were sampled regularly and the residues remaining in the 0- to 5- and 5- to 10-cm soil levels extracted and determined colorimetrically. By November 1972, between 28 and 42% of the applied linuron was recovered from plots at the four locations. Losses over winter were slight with approximately 30% of the initial herbicide treatment being recoverable from all soil types in May 1973. Linuron residues were still detectable in plots at all sites 18 mo after application. During winter persistence studies, 50–60% of the linuron applied in October 1972 was recovered from plots in May 1973, while 30% was detected in May 1974 following October 1973 treatments. In all samplings, linuron was found in the soil from the 0- to 5-cm level, with less than 5% of the initial applications being observed in the 5- to 10-cm depths, thus indicating negligible leaching under field conditions.

Arsenic Levels in Crops Irrigated with Water Containing MSMA

Weed Science ◽  
1978 ◽  
Vol 26 (4) ◽  
pp. 370-373 ◽  
Author(s):  
L. W. J. Anderson ◽  
J. C. Pringle ◽  
R. W. Raines
Keyword(s):  
Phaseolus Vulgaris ◽  
Atomic Absorption ◽  
Colorimetric Method ◽  
Sprinkler Irrigation ◽  
Arsenic Content ◽  
Small Field ◽  
Pinto Bean ◽  
Irrigated Crops ◽  
Elemental Arsenic ◽  
Field Plots

Mature plants of tomato(Lycopersicon esculentumMill. ‘Super Sioux’), cucumber(Cucumis sativasL. ‘Early pickling’), and pinto bean(Phaseolus vulgarisL.), in small field plots, were exposed once to sprinkler or furrow irrigation water containing 0.11 kg/ha or 1.12 kg/ha MSMA (monosodium methanearsonate). Concentrations of MSMA in water were about 0.22 ppmw and 2.2 ppmw for the two rates, respectively. Samples of crops and soil were subsequently analyzed for elemental arsenic content by colorimetric and atomic absorption methods. Arsenic residues were higher, compared to controls, only in crops exposed to MSMA applied in sprinkler irrigation. Average arsenic levels were highest in tomatoes exposed to 2.2 ppmw MSMA by sprinkler irrigation, and after 30 and 45 days were 0.26 ppm and 0.35 ppm, respectively. Average arsenic levels in sprinkler-irrigated crops ranged from double to triple the arsenic levels in control (untreated) crops. Atomic absorption was more sensitive than the colorimetric method and could detect smaller differences in arsenic content of samples. The average arsenic residues in soil varied from 1 to 3 ppm, but the differences could not be attributed to treatment with MSMA.

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