The relative immobility of fertilizer and native copper in an organic soil under field conditions

1979 ◽  
Vol 11 (2) ◽  
Author(s):  
S.P. Mathur ◽  
M.P. L�vesque ◽  
J.G. Desjardins
Keyword(s):  
Organic Soil ◽  
Field Conditions ◽  
Native Copper

Comparison of static and dynamic closed chambers for measurement of soil respiration under field conditions

1992 ◽  
Vol 72 (4) ◽  
pp. 605-609 ◽  
Author(s):  
P. Rochette ◽  
E. G. Gregorich ◽  
R. L. Desjardins
Keyword(s):  
Soil Respiration ◽  
Sandy Loam ◽  
Flux Measurement ◽  
Organic Soil ◽  
Exponential Model ◽  
Field Conditions ◽  
Parameter Estimates ◽  
Static Chamber ◽  
The Difference ◽  
Negative Exponential

The objective of this study was to compare the dynamic closed and static chamber techniques for the measurement of soil respiration under field conditions. The static chamber method consistently produced lower soil respiration values than did the dynamic closed system and the difference was larger at higher CO2 fluxes. A negative exponential model describes the relation between CO2 fluxes measured by both techniques. A good fit was obtained for measurements on a sandy loam soil (R2 = 0.61) and an organic soil (R2 = 0.74) but parameter estimates were different for each soil. Key words: Carbon dioxide, enclosure, gas flux measurement

CARROT RESPONSE TO SOIL TEMPERATURE AND COPPER, MANGANESE, ZINC AND MAGNESIUM

1971 ◽  
Vol 51 (2) ◽  
pp. 293-297 ◽  
Author(s):  
K. A. MacMILLAN ◽  
H. A. HAMILTON
Keyword(s):  
Soil Temperature ◽  
Copper Content ◽  
Organic Soil ◽  
Experimental Conditions ◽  
Native Copper ◽  
Manganese Zinc ◽  
Copper Manganese ◽  
Carrot Plant ◽  
Significant Yield ◽  
Mn Concentrations

Carrots grown under greenhouse conditions in a medium-decomposed, acid organic soil showed a significant yield and carrot length response to soil temperature and copper fertilization. Root lengths at 16 C were significantly greater than lengths at 12 and 20 C, which in turn were significantly greater than lengths at 8 C. Root and leaf yields at 8 C were significantly inferior to yields at 12, 16 and 20 C. The total native copper content of 10 ppm in soil, and leaf concentrations of 12 ppm in the tissue, were insufficient for normal carrot development under these experimental conditions. Application of copper at the rate of 25 ppm in soil significantly increased yields. Leaf concentrations of 145, 125 and 4440 ppm of Mn, Zn and Mg, respectively, in tissue, and soil concentrations of 60, 80 and 1300 ppm for Mn, Zn and Mg, respectively, were sufficient for normal carrot plant development. Increasing soil temperature significantly increased Cu and Mn concentrations in the leaves, and this occurred irrespective of whether the source of the respective nutrient was native or applied. In the case of Zn, leaf concentrations increased with increasing temperatures only when zinc was applied to the soil. With soil temperature above 12 C, magnesium concentrations in the leaves were significantly decreased and this was so for native or applied magnesium in the soil.

RESIDUES OF PARAQUAT AND LINURON IN AN ORGANIC SOIL AND THEIR UPTAKE BY ONIONS, LETTUCE AND CARROTS

1976 ◽  
Vol 56 (4) ◽  
pp. 407-412 ◽  
Author(s):  
S. U. KHAN ◽  
A. BELANGER ◽  
E. J. HOGUE ◽  
H. A. HAMILTON ◽  
S. P. MATHUR
Keyword(s):  
Organic Soil ◽  
Application Rate ◽  
Field Conditions ◽  
Vegetable Crops ◽  
Harvest Time ◽  
Treated Soil ◽  
Residue Levels

Paraquat (1,1′-dimethyl-4,4′-bipyridinium dichloride) and linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea] were applied to an organic soil, as spray treatments, at rates of 1.12 and 2.24 kg/ha, and 2.24 and 4.48 kg/ha, respectively. The persistence of the herbicides and their residues in lettuce (foliage), onions (root), and carrots (foliage and root) at harvest time were studied under field conditions. Proportionately more residues persisted in the soil from the higher rates of application of paraquat (2.24 kg/ha) and linuron (4.48 kg/ha). About 83–86% of the initial amounts of paraquat and 59–74% of the linuron remained in the soil 4 mo after application. Furthermore, about 50% of the paraquat was recovered from the treated soil 15 mo after application, whereas only about 20% of the linuron was recovered at the end of the same period. Carrots grown in this soil did not absorb detectable (>0.005 ppm) amounts of linuron, while onions and lettuce grown 12 mo after application absorbed the herbicide in various amounts. At the lower rate of application (2.24 kg/ha) linuron residue in onions was 0.014 ppm and that from the higher application rate (4.48 kg/ha) was 0.046 ppm. Lettuce had about 0.009 ppm residue, irrespective of the rate of application. Onions and lettuce grown on paraquat-treated soil had low residue levels (0.001–0.011 ppm). The study demonstrates the potential of paraquat and linuron residues to persist in organic soil, and their uptake by vegetable crops.

COUNTING TOTAL BACTERIA IN LAND ORGANIC WASTE HOUSEHOLD AND LAND INORGANIC WITH TOTAL PLATE COUNT METHOD (TPC)

2017 ◽  
Vol 4 (2) ◽  
pp. 87-91
Author(s):  
Ekamaida Ekamaida
Keyword(s):  
Soil Fertility ◽  
Bacterial Population ◽  
Organic Soil ◽  
Biological Properties ◽  
Plate Count ◽  
Bacterial Populations ◽  
Fertility Data ◽  
Plate Count Method ◽  
The Mean ◽  
Total Bacteria

The soil fertility aspect is characterized by the good biological properties of the soil. One important element of the soil biological properties is the bacterial population present in it. This research was conducted in the laboratory of Microbiology University of Malikussaleh in the May until June 2016. This study aims to determine the number of bacterial populations in soil organic and inorganic so that can be used as an indicator to know the level of soil fertility. Data analysis was done by T-Test that is by comparing the mean of observation parameter to each soil sample. The sampling method used is a composite method, which combines 9 of soil samples taken from 9 sample points on the same plot diagonally both on organic soil and inorganic soil. The results showed the highest bacterial population was found in total organic soil cfu 180500000 and total inorganic soil cfu 62.500.000

SAFARI 2000 ORGANIC SOIL CARBON AND NITROGEN DATA (ZINKE ET AL.)

2002 ◽  
Author(s):  
W. R. EMANUEL ◽  
J. S. OLSON ◽  
W. M. POST ◽  
A. G. STANGENBERGER ◽  
P. J. ZINKE
Keyword(s):  
Soil Carbon ◽  
Organic Soil ◽  
Carbon And Nitrogen ◽  
Soil Carbon And Nitrogen

LBA REGIONAL ORGANIC SOIL CARBON AND NITROGEN DATA (ZINKE ET AL.)

2003 ◽  
Author(s):  
W. R. EMANUEL ◽  
J. S. OLSON ◽  
W. M. POST ◽  
A. G. STANGENBERGER ◽  
P. J. ZINKE
Keyword(s):  
Soil Carbon ◽  
Organic Soil ◽  
Carbon And Nitrogen ◽  
Soil Carbon And Nitrogen
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