Morphophysiological Responses of Olive Plants of the Arbequina Cultivar in Acid Soils

The effects of soil acidity on nitrogen fixation by alfalfa (Medicago sativa L.) and red clover (Trifolium pratense L.) were investigated in field experiments at 28 locations, and in greenhouse experiments using soils from these locations. The pH of the soils (limed and unlimed) varied from 4.5 to 7.2. Rhizobia populations in the soil, nodulation, and relative forage yields (yield without N/yield with N) were measured in both the field and greenhouse experiments. Rhizobium meliloti numbers, nodulation scores, and relative yields of alfalfa decreased sharply as the pH of the soils decreased below 6.0. For soils with pH 6.0 or greater, there was very little effect of pH on any of the above factors for alfalfa. Soil pH in the range studied had no effect on nodulation scores and relative yields of red clover. However, R. trifolii numbers were reduced when the pH of the soil was less than 4.9. These results demonstrate that hydrogen ion concentration is an important factor limiting alfalfa growth on acid soils of Alberta and northeastern British Columbia, but it is less important for red clover. This supports the continued use of measurements of soil pH, as well as plant-available Al and Mn for predicting crop response to lime.

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Improved growth and yield of Faba beans (Vicia faba cv. Fiord) by inoculation with strains of Rhizobium leguminosarum biovar. viciae in acid soils in south west Victoria

Australian Journal of Agricultural Research ◽

10.1071/ar9940613 ◽

1994 ◽

Vol 45 (3) ◽

pp. 613 ◽

Cited By ~ 20

Author(s):

JM Carter ◽

WK Gardner ◽

AH Gibson

Keyword(s):

Vicia Faba ◽

Rhizobium Leguminosarum ◽

Field Experiments ◽

Natural Populations ◽

Acid Soils ◽

Growth And Yield ◽

Nitrogen Accumulation ◽

Commercial Strain ◽

South West ◽

Faba Beans

The response of faba beans (Vicia faba L. cv. Fiord) to seed inoculation with eight strains of Rhizobium leguminosarum biovar. viciae was examined in field experiments at six sites on acid soils in south-west Victoria. At two of the sites, two additional strains were examined, and in 1988, 14 strains were examined at one site. Very low natural populations of R. leguminosarum bv. viciae were found at the experimental sites. Most strains resulted in improved early nodulation and increased grain yield at all sites, when compared to inoculation with the commercial strain of rhizobia (SU391). Plant dry matter production and nitrogen accumulation in the plant shoot tissue was also increased at one site during the flowering period by some strains. Large visual differences between plots inoculated with SU391 and other strains were evident at most sites. Most uninoculated treatments were not nodulated and yielded very poorly. Treatments inoculated with the strain SU391 performed similarly to the uninoculated treatments.

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Productivity and morphology of Benggala grass Riversdale cultivar (Panicum maximum cv Riversdale) on acid soils

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/648/1/012085 ◽

2021 ◽

Vol 648 (1) ◽

pp. 012085

Author(s):

A Fanindi ◽

Sajimin ◽

E Sutedi ◽

I Herdiawan ◽

Harmini

Keyword(s):

Acid Soils ◽

Panicum Maximum

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SOLUBLE ALUMINIUM AND CALCIUM-ALUMINIUM EXCHANGE IN RELATION TO THE pH OF DILUTE CALCIUM CHLORIDE SUSPENSIONS OF ACID SOILS

Journal of Soil Science ◽

10.1111/j.1365-2389.1974.tb01128.x ◽

1974 ◽

Vol 25 (3) ◽

pp. 320-332 ◽

Cited By ~ 41

Author(s):

B. W. BACHE

Keyword(s):

Calcium Chloride ◽

Acid Soils

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The Physico-Chemical and Mineralogical Characterization of Mg-Rich Synthetic Gypsum Produced in a Rare Earth Refining Plant

Sustainability ◽

10.3390/su13094840 ◽

2021 ◽

Vol 13 (9) ◽

pp. 4840

Author(s):

Fatai Arolu Ayanda ◽

Mohd Firdaus Mohd Anuar ◽

Syaharudin Zaibon ◽

Shamshuddin Jusop

Keyword(s):

Rare Earth ◽

Acid Soils ◽

Acid Neutralization ◽

Mineralogical Characterization ◽

X Ray ◽

Neutralization Capacity ◽

Acid Neutralization Capacity ◽

Refining Plant ◽

Calcium Magnesium

The physical, chemical and mineralogical characterization of the constituents of magnesium-rich synthetic gypsum produced in a rare earth-refining plant located in Gebeng, Pahang, Malaysia was conducted through elemental chemical analysis, scanning electron microscopy with Energy Dispersive X-ray (EDX)-analyzer, thermal analysis, X-ray fluorescence and X-ray diffraction. The crystalline nature of the by-product was studied using FTIR spectroscopy. Elemental analysis confirmed the presence of Ca and Mg, which are essential macronutrients required by plants and this Ca alongside the high pH (9.17) of MRSG may confer on the material a high acid neutralization capacity. From the result, it was observed that the studied by-product is a heterogeneous crystalline material comprising of gypsum (CaSO4.2H2O) and other major components such as calcium (magnesium) compounds (hydroxide, oxide, silicates, and carbonate) and sulfur. These aggregates may contribute to give an acid neutralization capacity to MRSG. The XRD study of MRSG indicated a high content of gypsum (45.4%), shown by the d-spacing of 7.609 Å (2-theta 11.63) in the diffractogram. The infrared absorption spectra of MRSG indicate close similarities to mined gypsum. The results of the characterization indicated that MRSG has valuable properties that can promote its use in amending soil fertility constraints on nutrient-deficient tropical acid soils.

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