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    Arable & Livestock

    Foliar nutrition can help growers kickstart their crops

    Matthew TiltBy Matthew TiltFebruary 15, 20223 Mins Read
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    Liebig_barrel

    With the current pricing of crop nutrition, growers are being advised to ensure that all available nutrients are at an optimal level to maximise nitrogen uptake.

    Natalie Wood, agronomy operations manager at Yara, said: “We need to focus on nutrient use efficiency as a whole, rather than solely considering nitrogen. If you’re deficient in N, then applications can be made. However, that N won’t be used efficiently unless other nutrients are at an optimal level. Foliar applications of the right products can help you get there.”

    With the right nutrients in place, growers can ensure the plant is able to efficiently take up nitrogen when it comes into contact. Ms Wood recommends that the focus is on magnesium, phosphate and potassium.

    “At this time of year, phosphate is not readily available from the soil,” she said. “If you’re going on with NPK as a first application, it won’t reach the plant immediately; it takes time to naturally break down. To remedy this, we recommend applying a foliar product.”

    A foliar fertiliser with a high concentration of phosphate together potash and magnesium acts as a kickstarter to the crop. “Getting this on quickly after the first fertiliser application helps stimulate growth ensuring the plant is ready to maximise the benefit of that first application.”

    The availability of phosphate is crucial, as it is a vital part of the energy unit of the plant. As the crop has not been able to access phosphate within the soil, starting it off with a foliar product ensures the plant maximises applied nutrition.

    “In terms of when to apply phosphate, you would generally wait perhaps a week after your first NPK application,” said Ms Wood. “As always, take seasonal conditions into account.”

    Natalie Wood JUN2019 2
    Natalie Wood, agronomy operations manager for Yara.

    The purpose of this timing will ensure the plant is stimulated to grow while searching for additional nutrients. “Even if phosphate is coming from both the leaf and the roots at the same time it’s not an issue,” she said. “Ultimately, we’re attempting to improve uptake of nutrients that you’ve applied in the soil. A foliar application helps make that happen.

    “Leaf tissue testing will let you know any key nutrients that you need to apply later in the season. You can apply a cover-all product that contains multiple nutrients – this is definitely a good idea. Of course, in an ideal world, you would perform a test before T1 and apply a product like that as well, assuming you’ve got no major deficiencies. If you do have a major deficiency, you might need to go with straights.

    “As an analogy, a multi-vitamin won’t give you enough calcium if you are specifically deficient in it. You would have to take a calcium-specific product.”

    Ms Wood returns to the principle of Liebig’s barrel, often used to convey the holistic approach required for optimal crop nutrition:

    “We don’t want any limiting factors,” she said. “Liebig’s barrel is a useful way of illustrating this. Consider a normal barrel, with each of the wooden planks that compose it representing a different nutrient. If just one of those is too low, the water in the barrel will leak out.”

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    Matthew Tilt
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    Machinery editor for Farm Contractor & Large Scale Farmer. Matt has worked as an agricultural machinery journalist for five years, following time spent in his family’s Worcestershire contracting business. When he’s not driving or writing about the latest farm equipment, he can be found in his local cinema, or with his headphones in, reading a good book.

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