It is important to note however that in times of stress, i.e. drought, over-defoliation, season extension and nutrient deficiency; the grass plant becomes pressurised to develop its seed. Management of the grass plant is thereby crucial to allow us to reap the harvest of the energy and protein it builds. By understanding the production ambitions of grass and the steps it takes to achieve this, ruminant farmers can manipulate its growth characteristics to provide a highly nutritious, cost effective feed. Types of Grass & Clover Italian Ryegrass (IRG) The highest yielding type of grass and will produce heavy crops. IRG is less persistent than a perennial ryegrass, making them very useful for short term leys. Mainly used for cutting and producing silage or intensive spring grazing. Typically, Italian ryegrass has an upright growth habit with wide leaves. Mid-season growth can become stemmy but maintains good palatability and digestibility. Hybrid (HRG) Offering better persistency than IRG, it will also produce a high D value cut of silage. Perennial Ryegrass (PRG) This is by far the most commonly used grass seed in the UK, it is used in most types of seed mixtures. Far more persistent than Italian or hybrid, it is suitable for the longer term leys. It is very palatable, high yielding and does respond well to nitrogen applications. There are three categories of PRG, depending on heading date and growth habit. Early • Erect type • Mainly used for cutting leys • High yields for conservation • Early spring growth
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