Articles by Author: P W Farina

Search results for P W Farina

We found 21 results for you
  1. Assessment of aluminium tolerance in maize using a rapid screening procedure

    Assessment of aluminium tolerance in maize using a rapid screening procedure

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Routine testing for Al tolerance requires that screening procedures be both rapid and simple. Growth-chamber techniques, developed in the USA, show considerable promise in this regard and were used in this study to compare the Al tolerance of 10 maize...
  2. Potassium effects on stalk strength, premature death and lodging of maize (<em>Zea mays</em> L.)

    Potassium effects on stalk strength, premature death and lodging of maize (<em>Zea mays</em> L.)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In a field trial with maize, applications of potassium (K) proved to have a highly significant effect on stalk strength, premature death, root lodging and stalk breakage. A week prior to harvest the percentage of lodged plants varied from 77%...
  3. A comparison of several nitrogen- availability indices on four Natal maize-producing soils

    A comparison of several nitrogen- availability indices on four Natal maize-producing soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four methods used in obtaining nitrogen-availability indices were compared using soil and plant samples taken from maize trials conducted on four widely differing Natal soils. NO3 − N was determined after extraction of the soil with NH4HCO3, Ca(OH)2 and KCl,...
  4. A field evaluation of the differential tolerance to soil acidity of forty-eight South African maize cultivars

    A field evaluation of the differential tolerance to soil acidity of forty-eight South African maize cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A field experiment was conducted on a Normandien clay loam (Plinthic Paleudult) to compare the acid tolerance of 48 commercially grown maize (Zea mays L.) cultivars. Cultivars were compared in terms of grain yield, plant height and leaf Al content...
  5. Season and phosphorus age effects on the relationship between maize yield and phosphorus soil test on a highly weathered soil

    Season and phosphorus age effects on the relationship between maize yield and phosphorus soil test on a highly weathered soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    This paper discusses data obtained from a long-term N, P, K field experiment with maize (Zea mays L.) on a Normandien clay loam (Plinthic Paleudult) near Newcastle, Natal. After eight seasons plots were split, sub-plots being allowed either to rundown...
  6. Are soil-borne diseases depressing yields of continuously-grown maize in Natal?

    Are soil-borne diseases depressing yields of continuously-grown maize in Natal?

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Long-term field trials suggest that yields are declining where maize (Zea mays L.) is grown continuously in some parts of Natal. Available evidence indicates that the decline is not ascribable to soil fertility or climatic constraints and the possibility exists...
  7. The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils

    The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Acid, P-deficient soils with a large capacity to immobilize P favour the rapid decomposition of apatite. Such soils are widespread in the east of South Africa and the possibility exists that Langebaan rock phosphate (Langfos) may be a more cost-effective...
  8. Soil and plant potassium optima for maize on a kaolinitic clay soil

    Soil and plant potassium optima for maize on a kaolinitic clay soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In South Africa, there is an extreme paucity of information relating maize (Zea mays L.) yields to soil and plant K levels and most K fertilizer recommendations are highly subjective. Controversy also surrounds the practice of relating K fertilizer recommendations...
  9. Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions

    Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A previous investigation showed that Langebaan rock phosphate (Langfos) was not an effective substitute for superphosphate. However, in the light of reports that P availability is enhanced when phosphate rock (PR) and monocalcium phosphate are combined, an improvement in Langfos...