The effcts of fertilizers on herbage production. II. The effect of nitrogen, phosphorus and potassium on botanical and chemical composition

1964 ◽  
Vol 63 (2) ◽  
pp. 209-219 ◽  
Author(s):  
J. W. S. Reith ◽  
R. H. E. Inkson ◽  
W. Holmes ◽  
D. S. Maclusky ◽  
D. Reid ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Botanical Composition ◽  
Factorial Experiments ◽  
Rye Grass ◽  
N Treatment ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Clover Content

Six factorial experiments, each lasting 3 years, were carried out to determine the effects of N, P and K on herbage cut five times each year.Clover almost disappeared with the 87 lb. N treatment and none survived with the 174and 348 lb. dressings. N increased the proportions of rye-grass and cocksfoot in the sward. P had no influence on botanical composition. K usually increased the clover content in the absence of, but had practically no effect in the presence of, N.

Effects of time and rate of paraquat application on yield and botanical composition of annual pastures containing subterranean clover in a Mediterranean climate

1973 ◽  
Vol 13 (64) ◽  
pp. 556
Author(s):  
DW Barrett ◽  
GW Arnold ◽  
NA Campbell
Keyword(s):  
Dry Matter ◽  
Mediterranean Climate ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Botanical Composition ◽  
Minimum Loss ◽  
Major Species ◽  
Nitrogen Phosphorus ◽  
Clover Content ◽  
Made In

Pastures containing subterranean clover (Trifolium subterraneum) and either Vulpia spp. or Bromus rigidus as the other major species were sprayed at 0, 0.07, 0.14 and 0.21 kg a.i. ha-1 of paraquat ion between June and early October in Western Australia. Spraying removed the grasses and produced pastures containing up to 95 per cent clover. Mid-winter applications were more effective in increasing clover content than those made in spring. These changes in botanical composition were evident in the year following spraying, but were less marked. Yields of dry matter were reduced by paraquat, especially 'in the period immediately following spraying. These losses tended to decline as the growing season progressed, but at the close they were still evident on the Bromus rigidus pasture sprayed in July. Yields at the end of the subsequent season were similar on all treatments. Paraquat applied in mid-August at 0.14 kg a.i. ha-1 to both pastures produced the greatest change in botanical composition with the minimum loss of yield. The concentrations of nitrogen, phosphorus, calcium and magnesium were higher in mature herbage on paraquat treatments. Total yields of nutrients were similar between treatments because of reduced dry matter yield.

N, P and K on organic farms: herbage and cereal production, purchases and sales

1993 ◽  
Vol 120 (3) ◽  
pp. 353-360 ◽  
Author(s):  
S. M. Fowler ◽  
C. A. Watson ◽  
D. Wilman
Keyword(s):  
Dry Matter ◽  
Additional Data ◽  
Cereal Crops ◽  
Organic Farms ◽  
Efficient Conversion ◽  
Cereal Production ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Clover Content

SUMMARYYields of dry matter, nitrogen, phosphorus and potassium in herbage and cereals from fields representing different stages of the rotation were recorded on two organic farms in 2 years. Amounts of N, P and K purchased and sold were also recorded on these farms.Some additional data was obtained from three other organic farms. Herbage production was very satisfactory, whether fields were grazed or cut. The proportion of clover in sown swards was, in most cases, satisfactory to high, but the clover content was very low in a few fields. The yields of cereals were about equal to or below the average obtained on farms using fertilizer and other agrochemical inputs. Manure was normally applied to the leys, which were the fertility-building part of the rotation, rather than to the cereal crops. Leaching of K from manure heaps was considerable.Purchases of N, P and K (mainly in manure) seemed excessive on one of the farms. On one of the farms studied in less detail, less P and K were purchased than were sold. More attention could be given to the balance between purchases and sales of N, P and K and to the efficient conversion of N into saleable produce.

Dynamics, structure and properties of plant litterfall in a 120-year old beech stand in Middle Pomerania between 2007-2010

2013 ◽  
Vol 64 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Jerzy Jonczak
Keyword(s):  
Chemical Composition ◽  
Fagus Sylvatica ◽  
Structure And Properties ◽  
Weighted Mean ◽  
Beech Stand ◽  
Fagus Sylvatica L ◽  
Phosphorus And Potassium ◽  
Seed Coats ◽  
Maximum Content ◽  
Nitrogen Phosphorus

Abstract Studies of plant litterfall mass, its dynamics, structure and chemical composition were conducted between 2007.2010 in a 120-year old beech (Fagus sylvatica L.) stand located in Middle Pomerania. The annual mass of litterfall during the study period ranged from 2.793 to 5.398 t·ha.1 and its maximum was observed during the seed year. Leaves were the major component of plant litterfall and their contribution was 82.4.84.5% in the non-seed years and 47.2% during the seed year. Inflorescences, seeds, and seed coats were important components of litterfall during the seed year and accounted together up to 39.8% of the total litterfall mass. Particular fractions of litterfall significantly differed in the chemical composition. The highest concentrations of nitrogen, phosphorus and potassium were noticed in seeds and leaves collected in spring and the maximum content of calcium was observed in leaves collected in autumn. The weighted mean annual concentrations of nitrogen ranged within 0.81.1.13%, phosphate . 0.126.0.153%, potassium . 0.298.0.485% and calcium . 0.416.0.583%. The influx of elements with litterfall to the soil was: 167.3.225.9 kg·ha-1 of ash, 23.2.61.0 kg·ha-1 of nitrogen, 3.6.7.6 kg·ha-1 of phosphorus, 8.3.26.2 kg·ha-1 of potassium and 15.3.22.4 kg·ha-1 of calcium.

scholarly journals EFFECT OF FOLIAR FERTILIZATION AND SOME GROWTH REGULATORS ON THE CHEMICAL COMPOSITION AND THE PHOTOSYNTHETIC PIGMENTS OF CROTON PLANT LEAVES

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1101e-1101
Author(s):  
Mahmoud R. Shedeed ◽  
Khairy M. El-Gamassy ◽  
Alaa M. Almulla
Keyword(s):  
Chemical Composition ◽  
Chlorophyll A ◽  
Growth Regulators ◽  
Photosynthetic Pigments ◽  
Potassium Content ◽  
Plant Leaves ◽  
Foliar Fertilization ◽  
Chlorophyll A And B ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The experiment was designed to investigate the effect of Fulifertil at levels 0,2 and 4 gm/L and growth regulators GA3 at 0,100,200 and 300 ppm also kinetin at 0,25,50 and 75 ppm and their combination on croton plants. In general the results indicate that there were increases in the carbohydrates, nitrogen, phosphorus and potassium content. The anthocyanins and carotenoids pigments were increased while chlorophyll `a” and “b” pigments were decreased. These findings are required to give colorful leaves which give good display.

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