THE EFFECT OF FARM AND GREEN MANURES ON THE FERTILITY OF BLACKEARTH-MEADOW CLAY SOILS

1957 ◽  
Vol 37 (1) ◽  
pp. 48-56 ◽  
Author(s):  
E. A. Poyser ◽  
R. A. Hedlin ◽  
A. O. Ridley
Keyword(s):  
Organic Carbon ◽  
Gradual Increase ◽  
Red Clover ◽  
Yield Response ◽  
First Year ◽  
Green Manures ◽  
Gradual Decline ◽  
Carbon And Nitrogen ◽  
Average Decrease ◽  
Green Manure Crops

Green manure crops were ploughed down in the fallow year of a fallow, wheat, corn, wheat rotation to determine their effect on total organic carbon and nitrogen in the soil and on crop yields.An average decrease of 27.9 per cent of the organic carbon and 15.9 per cent of the nitrogen in the soil occurred over a 25-year period. Under sweet clover and farm manure the levels of organic carbon and nitrogen were significantly higher than the levels of these constituents under fallow treatment. The levels of organic carbon and nitrogen were not significantly affected by weeds, buckwheat, corn, rye, peas and red clover green crop treatments.There was little crop yield response to nitrogen-supplying green crops the first year after fallow. However, during recent years there was a gradual increase in yield response to nitrogen-supplying treatments in the second and third crops after fallow. This increased response to nitrogen probably reflected the gradual decline in the ability of the soil to supply nitrogen as total soil organic matter declined.

NEW CLOVER CULTIVARS FOR WAIKATO DAIRY PASTURE: ESTABLISHMENT, PRODUCTION AND NITROGEN FIXATION DURING THE FIRST YEAR

1988 ◽  
pp. 207-211
Author(s):  
S.F. Ledgard ◽  
G.J. Brier ◽  
R.N. Watson
Keyword(s):  
Nitrogen Fixation ◽  
White Clover ◽  
Dairy Cow ◽  
Red Clover ◽  
First Year ◽  
Buried Seed

Clover cultivars grown with ryegrass were compared in an establishment year under dairy cow grazing. There was no difference in total annual productton but summer production was greater with Pawera red clover and with Kopu or Pitau white clovers. Clovers differed little in the proportion of nitrogen fixed, except during summer when values were highest for Pawera. Pawera was less prone to nematode attack than white clover cultivars but was more susceptible to clover rot. Resident clovers and high buried seed levels (e.g., 11-91 kg/ha) made introduction of new clover cultivars difficult. Sown clovers established best (50-70% of total clover plants) when drilled into soil treated with dicamba and glyphosate. Keywords: white clover, red clover, nematodes. nitrogen fixation, pasture renovation

Stabilization of Organic Carbon and Nitrogen in Consolidating Benthal Deposits

1985 ◽  
Vol 17 (6-7) ◽  
pp. 929-940 ◽  
Author(s):  
C. W. Bryant ◽  
L. G. Rich
Keyword(s):  
Organic Carbon ◽  
Model Verification ◽  
Volatile Acid ◽  
Free Energies ◽  
Organic Loading ◽  
Carbon And Nitrogen ◽  
Loading Rates ◽  
Degradation Reactions ◽  
The Individual ◽  
Organic Deposits

The objective of this research was to develop and validate a predictive model of the benthal stabilization of organic carbon and nitrogen in deposits of waste activated sludge solids formed at the bottom of an aerated water column, under conditions of continual deposition. A benthal model was developed from a one-dimensional, generalized transport equation and a set of first-order biological reactions. For model verification, depth profiles of the major interstitial carbon and nitrogen components were measured from a set of deposits formed in the laboratory at 20°C and a controlled loading rate. The observed sequence of volatile acid utilization in each benthal deposit was that which would be predicted by the Gibbs free energies of the individual degradation reactions and would be controlled by the reduction in interstitial hydrogen partial pressure with time. Biodegradable solids were solubilized rapidly during the first three weeks of benthal retention, but subsequent solubilization occurred much more slowly. The benthal simulation effectively predicted the dynamics of consolidating, organic deposits. Simulation of organic loading rates up to 250 g BVSS/(m2 day) indicated that the stabilization capacity of benthal deposits was far above the range of organic loading rates currently used in lagoon design.

Effects of Cutting First Year Red Clover on Stand and Yield in the Second Year 1

1955 ◽  
Vol 47 (5) ◽  
pp. 224-228 ◽  
Author(s):  
James H. Torrie ◽  
Earle W. Hanson
Keyword(s):  
Red Clover ◽  
First Year ◽  
Second Year

Soil Organic Carbon and Nitrogen Variations with Vegetation Succession in Passively Restored Freshwater Wetlands

Wetlands ◽  
2021 ◽  
Vol 41 (1) ◽  
Author(s):  
Yu An ◽  
Yang Gao ◽  
Xiaohui Liu ◽  
Shouzheng Tong ◽  
Bo Liu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Vegetation Succession ◽  
Freshwater Wetlands ◽  
Carbon And Nitrogen

Dissolved organic carbon and nitrogen in the Western Black Sea

2007 ◽  
Vol 105 (1-2) ◽  
pp. 140-150 ◽  
Author(s):  
Hugh W. Ducklow ◽  
Dennis A. Hansell ◽  
Jessica A. Morgan
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Black Sea ◽  
Carbon And Nitrogen

scholarly journals Yield Response and Competition Ability of Italian Ryegrass, Red Clover and Their Mixture to Different Technological Conditions�

2018 ◽  
Vol 75 (1) ◽  
pp. 14
Author(s):  
Vasile IUGA ◽  
Ioan ROTAR ◽  
Anamaria MĂLINAŞ ◽  
Gheorghe TOTH
Keyword(s):  
Red Clover ◽  
Growth Behavior ◽  
Italian Ryegrass ◽  
Forage Yield ◽  
Yield Response ◽  
Competition Ability

The effect of different technological conditions on forage yield, growth behavior and competition ability of ryegrass, red clover and their mixture was analyzed. The results showed that red clover makes better use of the nutrition space in the case of variants sown in mixture with Italian ryegrass than in the monoculture, independent of the density of the plants or fertilization regime. The highest DM production was obtained at the mixture formed by red clover and Italian ryegrass on the variants sown on 12.5 cm distance between rows, the increase of the nutrition space being directly proportional to the decrease of the DM production in the case of this forage mixture.

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