General characteristics
According to Harris (1974) and Schwarz (1975), the hydroponics system includes all those methods in which plants grow in a substrate moisture-retention properties (sand, perlite, go rmiculita, sawdust, etc..
This chapter discusses different methods under the generic name of culture in aggregate and only particularized in those cases where there are methodological differences or economic importance. It is clear that the name is added to conventional farming and is only intended to simplify the study of hydroponic methods using absorbent substrates (some authors speak specifically sand culture, growth in vermiculite, etc.)..
added cropping system is the simplest of hydroponic cultivation. The roots develop and grow in an inert medium, usually with small particles and moisture holding capacity.
The substrate on which the roots grow to be fine enough to maintain an adequate level of moisture, yet not so fine that interfere with efficient ventilation. Air circulation occurs through the aggregate particles in a similar way to the ground. Technical problems
generally technical problems related to cultivation in aggregate are easier to solve than those related to crop cultivation solution or gravel. The physical characteristics differ markedly from the culture solution, bearing some resemblance to the cultivation of gravel.
then briefly discussed the main Technical problems in aggregate culture: Nutritional characteristics
acidity of the solution: Under experimental conditions and commercial practice have seen a proper plant growth in aggregates (mostly sand) irrigated with solutions ranging from highly acidic to slightly alkaline. However, the best pear production of most crops were placed under pH conditions ranging from medium to slightly acid. If the aggregate is not overly acidic or alkaline the solution is well-balanced acidity remain within the proper limits for a relatively long period of time. In any If the pH can be adjusted by adding an alkaline solution, dilute sulfuric acid or phosphoric acid. If this is the case of very acidic solution can be corrected by adding a little potassium hydroxide or a substance with similar properties.
phosphate level: Plants growing in sand and perlite may tolerate high levels of phosphate in the nutrient solution, compared to cropping systems in water and gravel. This is because the sand in excess of phosphates are precipitated as insoluble compounds. However, there is no reason to maintain a level greater than five mmol. It is possible to treat the sand with a concentrated solution of phosphate before planting, and then ignore subsequent applications of this radical for much or all of the life cycle of the crop.
iron level: Generally, to maintain a proper supply of this element in this culture system offers no problem. The addition of 1 to 5 ppm in the nutrient solution seems to be enough.
Ellis and Swaney (1963), mention that you can add iron in the form of magnetite sand before sowing the plants (1 to 10% by volume of magnetite).
physical characteristics: the problems of physical characteristics to include: aggregate type, aeration, drainage applications the solution, washed with rain.
type of aggregates: The most common substrates used in the culture added are: sand, perlite, vermiculite and sawdust.
More information ...
According to Harris (1974) and Schwarz (1975), the hydroponics system includes all those methods in which plants grow in a substrate moisture-retention properties (sand, perlite, go rmiculita, sawdust, etc..
This chapter discusses different methods under the generic name of culture in aggregate and only particularized in those cases where there are methodological differences or economic importance. It is clear that the name is added to conventional farming and is only intended to simplify the study of hydroponic methods using absorbent substrates (some authors speak specifically sand culture, growth in vermiculite, etc.)..
added cropping system is the simplest of hydroponic cultivation. The roots develop and grow in an inert medium, usually with small particles and moisture holding capacity.
The substrate on which the roots grow to be fine enough to maintain an adequate level of moisture, yet not so fine that interfere with efficient ventilation. Air circulation occurs through the aggregate particles in a similar way to the ground. Technical problems
generally technical problems related to cultivation in aggregate are easier to solve than those related to crop cultivation solution or gravel. The physical characteristics differ markedly from the culture solution, bearing some resemblance to the cultivation of gravel.
then briefly discussed the main Technical problems in aggregate culture: Nutritional characteristics
acidity of the solution: Under experimental conditions and commercial practice have seen a proper plant growth in aggregates (mostly sand) irrigated with solutions ranging from highly acidic to slightly alkaline. However, the best pear production of most crops were placed under pH conditions ranging from medium to slightly acid. If the aggregate is not overly acidic or alkaline the solution is well-balanced acidity remain within the proper limits for a relatively long period of time. In any If the pH can be adjusted by adding an alkaline solution, dilute sulfuric acid or phosphoric acid. If this is the case of very acidic solution can be corrected by adding a little potassium hydroxide or a substance with similar properties.
phosphate level: Plants growing in sand and perlite may tolerate high levels of phosphate in the nutrient solution, compared to cropping systems in water and gravel. This is because the sand in excess of phosphates are precipitated as insoluble compounds. However, there is no reason to maintain a level greater than five mmol. It is possible to treat the sand with a concentrated solution of phosphate before planting, and then ignore subsequent applications of this radical for much or all of the life cycle of the crop.
iron level: Generally, to maintain a proper supply of this element in this culture system offers no problem. The addition of 1 to 5 ppm in the nutrient solution seems to be enough.
Ellis and Swaney (1963), mention that you can add iron in the form of magnetite sand before sowing the plants (1 to 10% by volume of magnetite).
physical characteristics: the problems of physical characteristics to include: aggregate type, aeration, drainage applications the solution, washed with rain.
type of aggregates: The most common substrates used in the culture added are: sand, perlite, vermiculite and sawdust.
More information ...
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