Long term effect of superphosphate fertilisers on pasture persistence

Core samples were taken from 60-year-old pastures on a long-term fertiliser trial at the Winchmore research station, in Canterbury, New Zealand. Plots had been treated with 0, 188 or 376 kg/ha of superphosphate annually, grazed by sheep, and pasture yields were recorded. Ryegrass persisted in all treatments, but was only dominant in the superphosphate treatments, unsown grasses dominated in the no superphosphate treatments. White clover was more common with superphosphate, and both cocksfoot and timothy required adequate superphosphate in order to persist. Over 60 years of measurements, yields were 9-15 t DM/ ha with superphosphate, and did not reduce over time. Given adequate fertiliser, a ryegrass-based irrigated pasture can continue to produce high yields 60 years following sowing. Keywords: ryegrass, cocksfoot, t

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Long-Term Effect of Fertilizer and Crop Residue on Soil Fertility in the Moldavian Plateau

Cercetari Agronomice in Moldova ◽

10.2478/v10298-012-0012-y ◽

2012 ◽

Vol 45 (2) ◽

pp. 29-41 ◽

Cited By ~ 1

Author(s):

C. Ailincăi ◽

G. Jităreanu ◽

D. Bucur ◽

Despina Ailincăi

Keyword(s):

Organic Carbon ◽

Soil Fertility ◽

Crop Residue ◽

Term Effect ◽

Mineral Fertilizers ◽

Research Station ◽

Organic Carbon Content ◽

Mineral Fertilization ◽

Long Term Effect

Long-Term Effect of Fertilizer and Crop Residue on Soil Fertility in the Moldavian Plateau Since 1965, at the Agricultural Research Station of Podu-Iloaiei, Iaşi County, Romania (47°12' N latitude, 27°16' E longitude), investigations were conducted on the influence of different fertilizer systems on production and soil fertility. For wheat and maize crops, placed in a three-year rotation (pea - wheat - maize), three fertilization systems were experienced: (1) mineral fertilization with nitrogen and phosphorus rates until N140P100; (2) manure fertilization (20, 40, and 60 t/ha), with and without mineral fertilization and (3) mineral fertilizers + hashed residue applied in autumn under the base ploughing. The paper presented the results of investigations concerning the influence of long-term fertilization (46 years) on some chemical characteristics of Cambic Chernozem from the Moldavian Plateau. The climatic conditions in the Moldavian Plain were characterized by annual mean temperature of 9.6°C and a mean rainfall amount, on 50 years, of 553.5 mm, of which 141.5 mm during September-December and 412.0 mm during January-August. After 46 years of experiences, in pea-wheat-maize crop rotation, the content of organic carbon from soil has decreased by 22.3% (4.2 g/kg soil) at the unfertilized control and by 14.4% (2.7 g/kg soil) at the rate of N120P80. In wheat and maize, nitrogen uptake by weeds was between 7 and 9.5 kg/ha from all the plots. Applying moderate rates of mineral fertilizers (N80P60), together with 6 t/ha wheat straw or 40 t/ha manure, has determined the increase in organic carbon content from soil by 0.5 and, respectively, 2.8 g/kg.

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Long Term Evaluation of Biodegradation and Biocompatibility In-Vivo the Mg-0.5Ca-xZr Alloys in Rats

Crystals ◽

10.3390/cryst11010054 ◽

2021 ◽

Vol 11 (1) ◽

pp. 54

Author(s):

Eusebiu-Viorel Sindilar ◽

Corneliu Munteanu ◽

Sorin Aurelian Pasca ◽

Iuliana Mihai ◽

Madalina Elena Henea ◽

...

Keyword(s):

Bone Fractures ◽

Tissue Reaction ◽

Term Effect ◽

Metallic Materials ◽

Long Term Effect ◽

Term Evaluation ◽

Laboratory Examinations ◽

Over Time

Biodegradable alloys in Mg have the advantages of traditional metallic materials and those of biodegradable polymers with superior strength, lower density and ideal rigidity for fixing bone fractures. The biocompatibility and biodegradability of the five concentrations of Mg-0.5Ca-xZr alloys used were assessed using clinical and laboratory examinations that followed over time: tissue reaction, histological and imaging (RX, CT and SEM) evolution at 1, 2, 4 and 8 weeks after implant. The main purpose of this study was to investigate in vivo the long-term effect of Mg-0.5Ca-xZr alloys in rats. The results confirmed that Mg-0.5Ca-xZr alloys are biocompatible and biodegradable and are recommended to be used as possible materials for new orthopedics devices.

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