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  • Manganese and tomato uptake is influenced by ph and bacteria

    Manganese levels in nutrient solution do not influence tomato growth

    By Antonius Lecuona|Published On: February 22, 2015|Last Updated: February 22, 2015|Categories: Micro nutrients, Tomatoes|Tags: Manganese|

    The concentration of manganese (Mn) can vary significantly in re-circulating nutrient solutions. Crop uptake of manganese cannot be explained to this high variation and the only explanation is manganese oxidising bacteria or variation of pH of the nutrient solution. It is actually a combination of both manganese oxidising bacteria and solution pH. Manganese availability to [...]

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  • heating roots hydroponics nft

    Heating nutrient solution increases growth rate of tomatoes

    By Antonius Lecuona|Published On: November 2, 2014|Last Updated: June 10, 2021|Categories: Tomatoes|Tags: Roots, Temperature|

    Heating the nutrient solution in order to increase growth rate can provide growers an edge over competitors. This applies to all business categories. Heating up the nutrient solution can be complicated and expensive and that is where the competitive edge is. Not every grower has the ability to implement the technology effectively. Heating the root zone [...]

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  • lettuce mature management harvest predict head butter crisp iceberg hydroponics greenhouse

    How to predict when lettuce are ready for harvest

    By Antonius Lecuona|Published On: November 1, 2014|Last Updated: November 1, 2014|Categories: Lettuce|Tags: Light, Physiology, Temperature|

    Lets face it, lettuce is one of the fastest growing crops from transplanting to maturity. What makes it even more crucial is that the whole plant is harvested, unlike parsley or tomatoes where the harvest period can be extended. The great advantage is that more than one crop can be harvested per year, so staggering [...]

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  • cucumber nutrient uptake light intensity air temperature

    Nutrient uptake of cucumbers depends on light intensity and air temperature

    By Antonius Lecuona|Published On: September 22, 2014|Last Updated: March 17, 2017|Categories: Cucumbers|Tags: Nutrients, radiation, Temperature|

    When it comes to fertigation programmes or recipes, most commercial growers have a good indication of what is required. The nutrient program is either obtained from the fertilizer company or it is a tried and tested custom mix. Quite often what these recipes do not indicate or provide, is the variations of nutrients required within [...]

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  • How important is the ammonium/nitrate ratio

    By Antonius Lecuona|Published On: September 2, 2014|Last Updated: October 31, 2014|Categories: Macro nutrients, Tomatoes|Tags: Nutrients|

    The ammonium/nitrate ratio in the nutrient solution is important since it can have a significant effect on the quality and total yields of the tomato crop. Both NO3- and NH4+ are the most important sources of nitrogen in the plant. The ammonium/nitrate ratio has only become critical, and a problem, since growing without soil became commercially [...]

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  • tipburn in lettuce

    Tipburn in lettuce

    By Antonius Lecuona|Published On: July 27, 2014|Last Updated: November 1, 2014|Categories: Lettuce, Physiological disorders|Tags: Tipburn|

    Tipburn in lettuce has been a problem since the first farmer planted lettuce. Any grower will at some stage have the problem occur to some extent on his farm during warmer periods. The classic tipburn symptom is necrosis of the tips of rapidly growing young leaves.  Tipburn is visible externally on butterhead and cos types, [...]

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  • lettuce head formation

    How to get good iceberg lettuce head development

    By Antonius Lecuona|Published On: July 26, 2014|Last Updated: October 31, 2014|Categories: Lettuce|Tags: Quality|

    An iceberg lettuce head that is solid will always sell. Just watch people buying lettuce, they always feel the compactness of the heads first and then look at the size.  Compactness first then size.  Getting a good iceberg lettuce with good head formation starts with a variety first for the specific climate it is planted [...]

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  • greenhouse hydroponic commercial lettuce crisp iceberg

    Lettuce deficiency and toxicity symptoms of macro and micro elements

    By Antonius Lecuona|Published On: July 19, 2014|Last Updated: December 24, 2024|Categories: Lettuce, Macro nutrients, Micro nutrients, Physiological disorders|Tags: Deficiency, Toxicity|

    It is often quite difficult to identify a deficiency or toxicity symptom in the field because they never really occur as a single element deficiency or toxicity. Each of the elements are inter dependent and they influence each other within certain ratio’s. One would find for instance that phosphorus toxicity, is expressed as either a [...]

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  • nft hydroponics lettuce greenhouse farming vegetables gullies fertigation

    NFT is ideal for hydroponic lettuce production

    By Antonius Lecuona|Published On: July 19, 2014|Last Updated: October 31, 2014|Categories: Lettuce|Tags: closed systems, NFT|

    Lettuce was cultivated in 4500 B.C. in the Mediterranean basin. Only in 1543 was the first know head lettuce produced in Europe. Lettuce was first cultivated for the edible oils that the leaves produce. Only later, in Egypt, was lettuce leaves eaten raw. There are four lettuce types cultivated for the fresh market, these are: [...]

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