Manipulation of the tillering dynamics in a perennial ryegrass seed crop as a response to sowing date, sowing rate and grazing
Perennial ryegrass (Lolium perenne L.) seed crop is a profitable option for arable farmers in Canterbury. To achieve optimal yields there is a requirement of the crop to produce 2000 + seed heads/m² which is the result of >2000 reproductive tillers/m². The aim of this experiment is to quantify the effects of manipulating the tillering dynamics of a perennial ryegrass seed crop through the change in sowing date, sowing rate and grazing. Four sowing dates at 3 week successive intervals from the 27th of March with 4 target population densities of 200, 600, 1000 and 1400 plants/m² were sown. Times of sowing one through three with the population density of 200 – 1000 plants/m² reached the target of 2000+ fertile reproductive tillers/m² required for maximum seed yield. As sowing rate increased the number of vegetative tillers/m² also increased while the number or reproductive tillers/m² remained constant, therefore decreasing the proportion of reproductive tillers/m² as sowing rate increased. A reduction in the proportion of reproductive tillers was also seen with later sowings, along with individual reproductive tiller weight. A target population of 1400 plants/m² was impractical as increased self- thinning occurred and resulted in many of the plants dying before reproductive development. Sowing a Perennial ryegrass seed crop as late as 28th of May regardless of population density, tillering could not compensate for lost thermal time in regards to the production of reproductive tillers.... [Show full abstract]
KeywordsLolium perenne; perennial ryegrass; reproductive tiller; vegetative tiller; tillering; Grasslands Samson; tiller weights
Fields of Research070399 Crop and Pasture Production not elsewhere classified; 070305 Crop and Pasture Improvement (Selection and Breeding)
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Prasad, P. C. (Lincoln College, University of Canterbury, 1970)Tillering in cereals, ecologically important to plants and economically important to agronomists, is the result of the development of axillary buds into tillers. It has been shown to be affected mainly by nutrition, moisture, ...
Roy, Santosh Kumar (Lincoln College, University of Canterbury, 1985)Four experiments were conducted in controlled and field environments from 1982 to 1984 to establish relationships between dry matter growth rate and tillering, yield components and grain yield of wheat. In the first ...
Dutta, V. K. (Lincoln College, University of Canterbury, 1984)(1.) Recent investigations have shown that applying plant growth regulators (PGRs) to barley can prevent yield losses which would otherwise be caused by lodging and, in some conditions, enhance yield even in the absence ...