Quick Grow Indoor Garden Centre Articles. Plant Hormones and Thiamine (Vitamin B1). Hormones are produced naturally by plants, while plant growth regulators are substances applied to plants to influence growth and development in some way. Naturally derived PGRs, can be absorbed and deactivated inside plant tissues where as synthetic PGRs due to their chemical structure are resistant to break down inside the plant. Most often these types of compounds are applied as a foliar spray, although some work best if applied as a seed soak, or media drench around the plants base. The method of application of various PGRs depends on what compound is being used for a particular purpose, but usually their effects are short lived, and repeated applications are required to achieve the desired result. While auxins, gibberellins and cytokinins are considered to be growth promoters. Ethylene is a gas which can cause leaf abscission and ripening of certain types of fruit, however when applied at the correct concentration as Ethrel (foliar spray) it has been used to induce femaleness in flowers of cucumber and other dioecious plants. GA also increasing the rate of germination and break bud dormancy. GA stimulates cell division and elongation, and will stimulate bolting or flowering in some plants by causing cells in the flower bud to divide and expand lengthwise more rapidly than normal. Synthetic compounds such as Cycocel have been produced which are 'anti- gibberellins' and force a plant to remain dwarfed by blocking the elongation effect of the plant's natural Gibberellins. Cytokinins also slow down ageing or senescence in leaves, allowing them to stay green and actively photosynthesising for longer. Many PGRs only work when applied at a certain stage, and some are more effective if applied in the root zone where up take can be much greater than when spayed on the foliage. In tissue culture and rooting preparations, B1 helps to stimulate the growth of roots on new plants but this is best used in combination with rooting hormones. B1 can assist at any time in a plant's life with root regeneration where the root system has been damaged or stressed through high salinity, pathogens such as pythium, nutrient deficiencies and toxicities, high fruit loading etc but only if the foliage of the plant is unable to produce sufficient supplies for this purpose. Use of B1 is seen as a 'back up' or 'insurance policy' as it is difficult to determine if a plant which has come under stress is capable of producing sufficient B1 to send down to the root system to assist in cell development. Use of Vitamin B1 in plants is the same as in humans - it is most useful where a deficiency exists for some reason. B1 is best applied as a seed soak to speed up germination (root growth), or as a foliar spray. ![]() ![]() Soil amendments are made by adding fertilizer to the soil but there are different types of fertilizers. There is bulky organic fertilizer, such as cow manure, bat. ![]() In addition to nitrogen occurring as atmospheric dinitrogen gas in soil pore spaces, nitrogen occurs in both organic and inorganic forms in the soil. Organic fertilizers such as manures, compost.
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