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... Two pot experiments have been conducted to study separately the influence of two factors on applied P utilization by four crops: flax (Linum usitatissimitm, L., cv. ‘Redwood’), wheat (Triticum vulgare L., cv. ‘Manitou’), rape (Brassica napus L., cv. ‘Tanka’), and buckwheat (Fagopyrum esculentum Moench). These crops vary greatly in their ability to utilize P from band or pelletlike phosphate applic ...
... Remote sensing techniques supply useful crop information in large area crop survey programs. In such programs, however, the spectral and spatial resolution, measurement geometry, and environmental correction cap abilities have been limited by the fixed and truly remote nature of the sensor platform. To extend the applications of existing systems, or to use new systems, some workers have started sm ...
... Transitional grassland/forest light soils in Saskatchewan are often deficient in Cu. The high cost of micronutrient fertilizers necessitates extreme care in identifying micronutrient deficiencies and selecting effective products and methods of application. Comparison of tissue and grain or seed analysis for spring wheat (Triticum aestivum L.), canola (Brassica napus L.), and flax (Linum usitatissi ...
... Recessive genetic male-sterility has been widely used to facilitate crossing in recurrent selection programs in autogamous crop species. Dominant genetic male-sterility, on the other hand, has not been widely used. Mass and half-sib family selection schemes have been described for the dominant male-sterile program. Our objective was to describe S₁ family recurrent selection schemes and expected se ...
... Osmotic adjustment and changes in cell wall elastic modulus are important processes that enable plants to maintain physiological activity and prolong leaf survival as plant water deficits increase. This paper describes a simple and practical technique to produce tissue water-release curves that allows many measurements of osmotic potential (π), elastic modulus (ε), and apoplastic water fraction (A ...
... LEA proteins are late embryogenesis abundant in the seeds of many higher plants and probably universal in occurrence in plant seeds. LEA mRNAs and proteins can be induced to appear at other stages in the plant's life by desiccation stress and/or treatment with the plant hormone abscisic acid (ABA). A role it, protecting plant structures during water loss is likely for these proteins, with ABA func ...
... Several investigators have questioned the use of the ¹⁵N natural-abundance method of estimating N₂ fixation because of variability in soil δ¹⁵N and small differences between the δ¹⁵N of soil N and atmospheric N. Investigations were conducted to compare the ¹⁵N natural-abundance and ¹⁵N-isotope-dilution methods for estimating N₂ fixation of field-grown pea (Pisum sativum L.) and lentil (Lens culina ...
... Crop seeds and seedlings are exposed to drought, salinity and/or low soil temperatures in some areas. Therefore, the combined effects of these stresses on germination and emergence is of considerable interest. A growth room study was conducted to determine the effects of matric and osmotic potential at different temperatures on the rate and total number of seedling emergence for wheat (Triticum ae ...
... Growth chamber experiments of canola (Brassica napus L.) and spring wheat (Triticum aestivum L.) were conducted using three soils testing low in extractable sulfate (9-12 mg/kg). Experiments were designed to determine how the three soils compared in plant available sulfur (S) and to test the effects of various rates of potassium sulfate (K2SO4) and gypsum on the elemental composition and dry matte ...
... If different P fertilizers have been applied for a long time, it is difficult to measure the P availability. The objectives of this study were to investigate (i) the kinetics of soil P release by electroultrafiltration (EUF), (ii) extractable P using different soil extractants, (iii) plant P uptake, and (iv) the importance of considering both the P release kinetics and extractable P for plant P up ...