The effects of certain micronutrients on seed production by legumes, particularly double-cut red clover (Trifolium pratense), and pole beans (Phaseolus vulgaris L.)
department or school: Land and Food Systems, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Phillips, Arthur Harold
issued: 2012-03-02T16:18:58Z
issued: 1952
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The inconstancy of legume seed set has been recognized for some time, but the basic factors responsible for this irregularity have remained somewhat of a mystery. The literature on the subject is quite extensive and contains a diversity of opinions. Oddly enough the role of micronutrients seems scarcely to have been considered as a possible basic factor in legume seed setting. A study therefore has been made of the effects certain elements have on legume seed yields. The addition of lime to plots provided with molybdenum or phosphate on an acid clay soil in the Fraser Valley of British Columbia, with 900-1200 P.P.M. available calcium, markedly increased red clover seed yields. Without lime, the only response was obtained from additions of phosphate and potash. The addition of nitrogen to plots, on similar soil, which received molybdenum, sulphur, and phosphate resulted in markedly increased seed yields of double-cut red clover over the control. Without nitrogen there was a greater response on this soil to additions of phosphate, molybdenum and sulphur. The response to molybdenum was much greater, in both seed and forage, where plants were not provided with combined nitrogen, but where they largely depended on symbiotic nitrogen fixation for their nitrogen supply. The increased yield from sulphur attributable to this element having an indirect effect upon legumes through its direct' action, or effect, upon the nitrogen fixing organisms. Pole beans grown on a sandy loam soil with a pH 5.5 and 900 P.P.M. "available" calcium, produced more seed following applications of phosphate. The response was noted at several levels of lime and nitrogen. Molybdenum with lime, and sulphur with nitrogen also Improved seed yields. On a clay soil with a pH 4.8 and 500 P.P.M. "available calcium" the addition of lime increased all seed yields regardless of other treatments. The only other treatment to show a uniform and greatly increased seed yield, was an application of boron. On this c…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/41077
note: THE EFFECTS OF CERTAIN MICRONUTRIENTS ON SEED PRODUCTION BY LEGUMES, PARTICULARLY DOUBLE-CUT RED CLOVER (Trifoli u m pratense), AND POLE BEANS (Phaseolus vulgaris L.) by ARTHUR HAROLD PHILLIPS, B.S.A. A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN AGRICULTURE IN THE DEPARTMENT OF AGRONOMY We accept t h i s thesis as conforming to the standard required from candidates for the degree of Master of Science i n Agriculture. Members of the Department of THE UNIVERSITY OF BRITISH COLUMBIA APRIL 1952 - i -ABSTRACT The inconstancy of legume seed set has been recog-nized for some time, but the basic factors responsible f o r t h i s i r r e g u l a r i t y have remained somewhat of a mystery. The l i t e r a t u r e on the subject i s quite extensive and contains a d i v e r s i t y of opinions. Oddly enough the role of micronutri-ents seems scarcely to have been considered as a possible basic factor i n legume seed setting-. A study therefore has been made of the effects cer-t a i n elements have on legume seed y i e l d s . The addition of lime to plots provided with molybdenum or phosphate ?on an acid clay s o i l i n the Fraser Valley of B r i t i s h Columbia, with 900-1200 P.P.M. available calcium, mark-edly increased red clover seed y i e l d s . Without lime, the only response was obtained from additions of phosphate and potash. The addition of nitrogen to p l o t s , on s i m i l a r s o i l , which received molybdenum, sulphur, and phosphate resulted i n markedly increased seed yi e l d s of double-cut red clover over the control. Without nitrogen there was a g r e a t e r response on t h i s s o i l to additions of phosphate, molybdenum and sulphur. The response to molybdenum wasmuch greater, i n both seed and forage, where plants were not provided with combined nitrogen, but where they lar g e l y depended on symbiotic nitrogen f i x a t i o n f o r t h e i r nitrogen supply. The increased y i e l d from sulphur…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0106725
language: eng
degree discipline: Plant Science
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/41077