Cropping Strategies
Issue 2 - Nitrogen in Perennial Ryegrass Seed Crops, Canopy Management Strategy for Autumn Sown Oilseed Rape
This booklet is split into two sections. The first is nitrogen in perennial ryegrass seed crops.Nitrogen is applied to perennial ryegrass in spring to increase ear numbers, canopy size and/or to produce dry matter for livestock production. In effect all of the above can be classed as promoting growth. In perennial ryegrass seed production the promotion of shoot growth leads to potential problems later in the season associated with lodging. The second section is canopy management strategy for autumn sown oilseed rape which includes nitrogen rate, nitrogen timing, seed rate andplant growth regulators.
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Issue 1 - Nitrogen Application in Wheat
Summary: It is very important to measure the soil mineral N as it varied from 20 to 207 kg N/ha in these trials. The optimum N application increased yield by 50 to 60% in irrigated wheat but the response in dryland wheat was very variable. The optimum nitrogen use efficiency (NUE) was highest in irrigated feed wheat and lowest in dryland milling wheat. There is no economic benefit in applying N for protein in Conquest milling wheat if the N applied through stem elongation has maximised yield. Forecasting the N supply from mineralisation is an important area for further work.
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