Survival of Rhizobium japonicum as Affected by Different Levels of Moisture and Organic Matter in Sandy Soils

1991 ◽  
Vol 146 (7-8) ◽  
pp. 545-547 ◽  
Author(s):  
L.N. Verma ◽  
A.K. Rawat
Keyword(s):  
Organic Matter ◽  
Sandy Soils ◽  
Rhizobium Japonicum ◽  
Different Levels

Organic matter fractions and N mineralization in vegetable-cropped sandy soils

2013 ◽  
Vol 29 (3) ◽  
pp. 333-343 ◽  
Author(s):  
K. Jegajeevagan ◽  
S. Sleutel ◽  
N. Ameloot ◽  
M. A. Kader ◽  
S. De Neve
Keyword(s):  
Organic Matter ◽  
N Mineralization ◽  
Sandy Soils ◽  
Organic Matter Fractions

Organic Matter Fractions Controlling Soil Water Repellency in Sandy Soils From the Doñana National Park (Southwestern Spain)

2014 ◽  
Vol 27 (5) ◽  
pp. 1413-1423 ◽  
Author(s):  
Nicasio T. Jiménez‐Morillo ◽  
José A. González‐Pérez ◽  
Antonio Jordán ◽  
Lorena M. Zavala ◽  
José María Rosa ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Water ◽  
National Park ◽  
Sandy Soils ◽  
Water Repellency ◽  
Soil Water Repellency ◽  
Doñana National Park ◽  
Organic Matter Fractions

scholarly journals Priming and substrate quality interactions in soil organic matter models

2013 ◽  
Vol 10 (3) ◽  
pp. 2089-2103 ◽  
Author(s):  
T. Wutzler ◽  
M. Reichstein
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Balance Model ◽  
Levels Of Abstraction ◽  
Substrate Quality ◽  
Substrate Limitation ◽  
Energy Limitation ◽  
Bare Fallow ◽  
Different Levels

Abstract. Interactions between different qualities of soil organic matter (SOM) affecting their turnover are rarely represented in models. In this study, we propose three mathematical strategies at different levels of abstraction to represent those interactions. By implementing these strategies into the Introductory Carbon Balance Model (ICBM) and applying them to several scenarios of litter input, we show that the different levels of abstraction are applicable at different timescales. We present a simple one-parameter equation of substrate limitation that can straightforwardly be implemented into other models of SOM dynamics at decadal timescale. The study demonstrates how substrate quality interactions can explain patterns of priming effects, accelerate turnover in FACE experiments, and the slowdown of decomposition in long-term bare fallow experiments as an effect of energy limitation of microbial biomass. The mechanisms of those interactions need to be further scrutinized empirically for a more complete understanding. Overall, substrate quality interactions contribute to both understanding and quantitatively modelling SOM dynamics.

scholarly journals Intake, digestibility, and ruminal parameters of Nellore bulls supplemented with increasing levels of crude glycerin in Brachiaria Brizantha pastures

2017 ◽  
Vol 18 (4) ◽  
pp. 518-529 ◽  
Author(s):  
Adriano Jorge Possamai ◽  
Joanis Tilemahos Zervoudakis ◽  
Luciana Keiko Hatamoto-Zervoudakis ◽  
Lucien Bissi da Freiria ◽  
Pedro Ivo José Lopes da Rosa Silva ◽  
...  
Keyword(s):  
Organic Matter ◽  
Latin Square ◽  
Serum Glucose ◽  
Nutrient Digestibility ◽  
Crude Glycerin ◽  
Brachiaria Brizantha ◽  
Mineral Mixture ◽  
Organic Matter Digestibility ◽  
Four Levels ◽  
Different Levels

SUMMARY We evaluated the effects of increasing levels of crude glycerin in multiple supplements for grazing beef cattle on intake, nutrient digestibility, pH, ruminal ammoniacal nitrogen, and serum glucose. Five Nellore steers (initial BW of 480 kg [SD 15]), grazing a tropical pasture, were used in a 5 × 5 Latin square design. The treatments used were control (no supplementation; only a mineral mixture ad libitum) and four levels of crude glycerin (0, 80, 160, 240 g/kg of supplements). Supplementation type had no impact (P > 0.05) on pH at 0 and 4 h after supplementation. Animals supplemented with different levels of crude glycerin showed higher N-NH3 values (P < 0.05) at 4 h after supplementation. Crude glycerin supplementation did not reduce pasture intake (P > 0.05), increasing dry matter intake (P > 0.05) due to increased organic matter digestibility (P > 0.05). Supplementation of 4 kg/animal with crude glycerin (240 g/kg supplement) did not reduce pasture intake and organic matter digestibility.

Modelling soil organic matter changes in ley-arable rotations in sandy soils of Northeast Thailand

1998 ◽  
Vol 49 (3) ◽  
pp. 463-470 ◽  
Author(s):  
J. WU ◽  
A. G. O'DONNELL ◽  
J. K. SYERS ◽  
M. A. ADEY ◽  
P. VITYAKON
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Sandy Soils ◽  
Northeast Thailand

Water repellence in sandy soils of South-Western Australia. II. Some chemical characteristics of the hydrophobic skins

Soil Research ◽  
1972 ◽  
Vol 10 (1) ◽  
pp. 35 ◽  
Author(s):  
FJ Roberts ◽  
BA Carbon
Keyword(s):  
Organic Matter ◽  
Diethyl Ether ◽  
Cold Water ◽  
Sandy Soils ◽  
Prolonged Treatment ◽  
Water Repellent ◽  
Chemical Characteristics ◽  
Produce Water ◽  
Water Repellence ◽  
Humic Fraction

The hydrophobic organic skins on sand grains were resistant to removal by solvents such as cold water, concentrated acid, diethyl ether, ethanol, benzene, chloroform, and acetone. Prolonged treatment with hot diethyl ether, ethanol, and benzene removed part of the coating. Treatment with dilute solutions of alkali removed the skin as suspended particles. Compounds within the very stable humic fraction of the soil organic matter appeared to be mainly responsible for water repellence in soils. Deposits of fresh organic materials could also produce water repellent properties.

Organic matter recovery in sandy soils under bush fallow in southern Mozambique

2008 ◽  
Vol 83 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Alfredo B. J. C. Nhantumbo ◽  
Stig Ledin ◽  
Christiaan C. Du Preez
Keyword(s):  
Organic Matter ◽  
Sandy Soils ◽  
Bush Fallow

scholarly journals Impact of Opened, Non Opened Pollination and Nitrogen Fertilizer on Sesame Production in the Reclaimed Lands, Ismailia Governorate, Egypt

2013 ◽  
Vol 46 (3) ◽  
pp. 57-68
Author(s):  
A.E.H. Blal ◽  
S.M. Kamel ◽  
H.M. Mahfouz ◽  
M. Said
Keyword(s):  
Nitrogen Fertilizer ◽  
Sandy Soils ◽  
Open Pollination ◽  
Insect Pollination ◽  
Qualitative And Quantitative ◽  
Growing Seasons ◽  
Pass Through ◽  
Quantitative Indicators ◽  
The Impact ◽  
Different Levels

Abstract The research was conducted at the Agriculture Research Farm, Faculty of Agriculture, University of Suez Canal, during the sesame growing seasons of 2011 and 2012. For studying the impact of insect pollination and nitrogen fertilization on sesame production, the experiment was divided to 13 treatments of open pollination and non open pollination, with three different levels of ammonium nitrate (NH4NO3) and one level of seryalin as biofertilizer. Non opened pollination treatments were covered before the start of flowering period with a perforated net bag, to allow the air to pass through and to prevent insects from approaching the plants. Quantitative and qualitative indicators, were measured as follows: rate of capsule per plant, capsule weight, rate of seeds in each capsule, weight of 1000 seeds, germination (%), seedlings vigour and oil content (%). Results clearly demonstrate that qualitative and quantitative indicators of sesame crop was significantly increased with opened pollination and with the increase of nitrogen fertilizer level up to 40 kg N/feedan-1 plus or minus seryalin, in reclaimed sandy soils, in Ismailia, Egypt.

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