A New Method of Comparing the Productivity of Crops on Arable Land in England and Wales, Scotland and Denmark

1929 ◽  
Vol 92 (4) ◽  
pp. 559
Author(s):  
Harald Faber
1994 ◽  
Vol 123 (2) ◽  
pp. 199-205 ◽  
Author(s):  
P. A. Siddons ◽  
R. J. A. Jones ◽  
J. M. Hollis ◽  
S. H. Hallett ◽  
C. Huyghe ◽  
...  

SummaryA model was developed to assess the suitability of land in England and Wales for growing newly developed genotypes of autumn-sown determinate white lupins. The model used soil pH, the number of degree-days accumulated for mainstem leaf production before the apical meristem of the mainstem became floral, and the number of machinery work days in autumn. Interactions between these three components were used to set thresholds to determine land suitability within 5 × 5 km grid squares of the National Soil Map.Of the potential 13·75 Mha of arable land in England and Wales, a total of 7·54 Mha are well or moderately suited to growing these lupin genotypes. This is equivalent to c. 2 Mha of land within the arable rotation each year. It was estimated that, because of low soil pH, lupins would be the preferred legume on 0·3 Mha out of this 2 Mha. The model was also used to assess the risk of soil acidification and nitrate leaching following mineralization of lupin residues. This exercise indicated that there was little risk of either on much of the land suited to lupins.


1949 ◽  
Vol 1950 ◽  
pp. 54-62
Author(s):  
E. T. Halnan

The Eastern Counties is an area extending from the Wash to the Thames; and includes Bedfordshire, Cambridgeshire, Isle of Ely, Hertfordshire, Huntingdonshire, parts of Lincolnshire (Kesteven and Holland), Norfolk, East and West Suffolk, and Essex. It is well farmed, is largely arable (arable land 77.3%, pasture 19.5%, rough grazing 3.2% (1944)); and well suited to the production of abundant supplies of cereal grains which form the main basis of poultry diets. In addition, the soil types range from light sandy soils through alluvial and fen soils to heavy clay; from sandy heaths to low lying rich meadow and marsh land, and the climatic conditions are such as to suit poultry production. It is therefore not surprising to find poultry keeping in all its branches forming a profitable side line to the practice of general farming. The low lying meadow and marsh areas are particularly well suited to the rearing of ducks, on the lighter sandy soils numerous flocks of turkeys are kept, while throughout the area where suitable rough grazing exists small flocks of geese are reared. Fowls are also well distributed throughout the area on the better drained soils. The extent to which poultry are kept in the Eastern Counties can be appreciated by studying the census figures, no less than 17.7% of the fowls in England and Wales, 20.8% of the ducks, 12.6% of the geese, and 21.5% of the turkeys being reared in the Eastern Counties in 1948.


Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.


1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  

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