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- W1541936114 abstract "Increases in wheat production due to breeding may be reachinga plateau. The application of N-fertilizer beyond optimum levelsleads to lodging and to an increase in tiller death. The use ofplant growth regulators (retardants) may be an answer for futureincreases in production.Experiments were conducted in 1983 and 1984 to apply growthretardant paclobutrazol to reduce lodging under heavy rates ofnitrogen, to determine if such an approach could reduce tiller mortality,partition more dry matter to the seed, and increase yieldand yield components of the semi-dwarf winter wheat variety Yamhill.The application of paclobutrazol significantly reduced lodgingpromoted by nitrogen fertilizer. The reduction in lodging did notaffect yield in part because lodging occurred late at the hard doughstage of development.The application of paclobutrazol at floral initiation actuallyincreased tiller death by promoting the formation of late tillersthat died before reaching maturity. Investigation of applyingpaclobutrazol at earlier stages of development of wheat is suggested. Paclobutrazol application reduced the total dry matter productionby decreasing dry matter accumulation in the stem. Dry matterlost from stems was not apparently relocated in the ear. Ear dryweight remained the same following the application of paclobutrazol.Nitrogen application in these tests seemed to reduce the capacityof the ear to accept carbohydrate by decreasing the number offlorets per spikelet. It also decreased seed weight in 1983 andgrain yield in 1983 and 1984. An increase in L.A.I. (leaf areaindex) may have increased mutual shading with negative effects ontiller development.Paclobutrazol application decreased grain yield and harvestindex by decreasing seed weight and by reducing the number of grainsper ear in 1984. The decrease in seed weight was attributed to competitionfrom non-surviving tillers and to the reduction in L.A.D.(leaf area duration) due to stripe rust incidence.Further work is needed to evaluate possible paclobutrazol x Ninteraction on a variety of wheat susceptible to lodging. Differentlocations and more effective control of diseases would be requiredfor such studies. Application of paclobutrazol at different stagesof growth should be investigated. Also, an investigation of paclobutrazolinterference with nitrogen uptake and utilization issuggested." @default.
- W1541936114 created "2016-06-24" @default.
- W1541936114 creator A5078693742 @default.
- W1541936114 date "1985-06-13" @default.
- W1541936114 modified "2023-09-23" @default.
- W1541936114 title "Effects of growth retardant and nitrogen level on growth, development and yield of Yamhill wheat" @default.
- W1541936114 hasPublicationYear "1985" @default.
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