Soil and Crop Response to Varying Levels of Compaction, Nitrogen Fertilization, and Clay Content

2011 ◽  
Vol 75 (4) ◽  
pp. 1483-1492 ◽  
Author(s):  
E. G. Gregorich ◽  
D. R. Lapen ◽  
B. L. Ma ◽  
N. B. McLaughlin ◽  
A. J. VandenBygaart
Keyword(s):  
Nitrogen Fertilization ◽  
Clay Content ◽  
Crop Response

POTASSIUM STATUS OF SOME QUEBEC SOILS: K RELEASED BY NITRIC ACID AND SODIUM TETRAPHENYLBORON AS RELATED TO PARTICLE SIZE AND MINERALOGY

1984 ◽  
Vol 64 (1) ◽  
pp. 99-106 ◽  
Author(s):  
T. AL-KANANI ◽  
A. F. MacKENZIE ◽  
G. J. ROSS
Keyword(s):  
Nitric Acid ◽  
Ammonium Acetate ◽  
Clay Content ◽  
Mineralogical Composition ◽  
Strong Relationship ◽  
Crop Response ◽  
Surface Samples ◽  
K Fertilizer ◽  
Sodium Tetraphenylboron ◽  
K Release

The K release characteristics of surface samples from five Quebec soils were investigated. Each soil was fractionated by size into six separates. Each separate was extracted with 1 M ammonium acetate (NH4OAc), with 1 M nitric acid (HNO3) and with sodium tetraphenylboron (NaTPB) and the K extracted was determined. The clay separates contained most of the HNO3 and NaTPB-extractable K. The average amounts of K removed by 1 M HNO3 and NaTPB from the clay was up to 16 times more than that released from silt or sand fractions. The strong relationship between extractable K and clay content was probably due to the similarity in mineralogical composition and degree of weathering of these soils. Clay-sized chlorite and vermiculite were destroyed by the HNO3 extraction but not by the NaTPB extraction. Crop response to K fertilizer was generally reduced as clay content and extractable K increased. Key words: Extractable K, NaTPB-K, HNO3-K

A Classification System for Factors Affecting Crop Response to Nitrogen Fertilization

1995 ◽  
Vol 87 (5) ◽  
pp. 869-876 ◽  
Author(s):  
John A. Lory ◽  
Michael P. Russelle ◽  
Gyles W. Randall
Keyword(s):  
Nitrogen Fertilization ◽  
Classification System ◽  
Crop Response ◽  
Factors Affecting

The influence of nitrogen fertilization on protein yield and nutrient uptake in different triticale genotypes

2007 ◽  
Vol 35 (2) ◽  
pp. 253-256
Author(s):  
Milan Biberdžić ◽  
Ivica Đalović ◽  
Aleksandar Paunović ◽  
Ilija Komljenović
Keyword(s):  
Nutrient Uptake ◽  
Nitrogen Fertilization ◽  
Protein Yield

Energetic relationships for crushing of soil clods

2006 ◽  
Vol 2 (1) ◽  
pp. 51-72
Author(s):  
István Patay ◽  
Virág Sándor
Keyword(s):  
Moisture Content ◽  
Specific Energy ◽  
Soil Moisture Content ◽  
Energy Requirement ◽  
Clay Content ◽  
Clay Soils ◽  
Rigid Support ◽  
Soil Plasticity ◽  
Specific Energy Requirement ◽  
The Relationship

Clod crushing is a principal problem with soils of high clay content. Therefore, there is a need for determining the conditions for clod breaking and clod crushing. The objective of the work was to develop a special purpose tool for single clod breaking both by rigid support of the clod and by a single clod supported by soil and to develop a machine for clod crushing. Furthermore, the purpose was to determine the relationship between the specific energy requirement for clod crushing in the function of soil plasticity and the soil moisture content by the means of the developed tool and machine. The main result of the experiments is summarized in a 3D diagram where the specific energy requirement for soil clod crushing is given in the function of the moisture content and the plasticity index for different clay soils.

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