Irrigation scheduling – refining the wheel not reinventing it

Non-Peer Reviewe

Improving profitability of flax production in high moisture environments

Non-Peer ReviewedThe advent of canlin cultivars of flax appears to offer the potential for greatly expanded flax acreage providing yields are high enough. Over the period of time 1988-93 average yields of McGregor flax were similar to those of Global canola under irrigated conditions at Outlook Saskatchewan. Scelerotinia and blackleg do not affect flax and both species appear to have similar effects of subsequent cereal grain crops. Delaying planting has reduced yields by 20 % in years where early frosts did not affect yields. Early planting would generally preclude the use of trifluralin since planting into cold soils is not recommended. Flax planted at the end of May can be up to 10 cm taller than crops planted in early May. High seeding rates reduced yields in all 3 years. High seeding rates sometimes induced more lodging, but this affect was not consistent. Narrow row spacings did not increase seed yields. High yields can be obtained over a wide range of seeding rates and row spacings providing weed control is excellent and seeding is done during the first half of May

Pasmo disease and lodging in flax as affected by fungicide, N fertility and year

Non-Peer Reviewe

Effect of fungicide and N applications on lodging and disease in flax

Non-Peer Reviewe

Management of leaf spotting diseases of winter wheat in western Canada

Non-Peer Reviewe

Crown rust in oats: when are fungicide applications to control crown rust of economic benefit to producers?

Non-Peer Reviewe

Impact of tillage system, preceding crops, and P fertilizer on economic performance of flax production

Non-Peer ReviewedConservation farming is a system approach that considers all factors that affect production. Reduced tillage is one of the methods of conservation farming and is becoming increasingly popular on the prairie. This will impact directly on nutrient availability and on fertilizer and other chemical management decisions. Phosphorus (P) supply, and its availability in early stages of plant growth, is critical to the determination of optimum crop yield. Producers frequently avoid P application in flax and increase the P supply in the preceding crops since flax is very sensitive to seed-placed applications of monoammonium phosphate. Along with supplying residual P, a preceding crop such as wheat and canola may also have different impacts on yield and performance of flax depending upon its association with mycorrhizae. Since flax is a highly mycorrhizal crop, it is possible that mycorrhizal associations could be responsible for part of the positive response that flax shows in zero-till systems and the limited P response observed in recent studies. If so then P fertility requirements in flax could be greatly affected by the tillage system and by whether the preceding crop was mycorrhizal or not. Phosphorus fertilization could possibly be reduced or eliminated in flax grown in zero-till following a mycorrhizal crop and optimized in flax grown under conventional tillage management. By more clearly defining the P requirements of flax, canola and wheat grown under different management systems, it is possible to reduce inputs while maintaining or improving crop yield and quality. While many research studies have evaluated the economic impact of tillage systems on N fertility requirements, there has been very limited information available on the economic impact of tillage management and P phytoavailability or on the impact of the tillage system and past phosphorus fertilizer management on phosphorus response of crops. The objective of this study is to evaluate the economic impact of flax on tillage system, P fertilizer application, preceding crop, and level of P fertilizer applied in preceding crop

Mass Dependence of M3Y-Type Interactions and the Effects of Tensor Correlations

The mass dependence of the M3Y-type effective interactions and the effects of tensor correlations are examined. Two-body nuclear matrix elements are obtained by the lowest order constrained variational (LOCV) technique with and without tensor correlations. We have found that the tensor correlations are important especially in the triplet-even (TE) and tensor-even (TNE) channels in order to reproduce the G-matrix elements obtained previously. Then M3Y-type potentials for inelastic scattering are obtained by fitting our two-body matrix elements to those of a sum of Yukawa functions for the mass numbers A=24, A=40 and A=90.Comment: 13 pages, 6 table