Nutrient Solution

Nutrient Solution

 

a mixture of mineral salts that are essential for plant nutrition. Nutrient solutions are used in the pot method of studying plants (seePOT METHOD).

Experiments to select the composition of nutrient mixtures were begun in the mid-19th century, when it was established that normal plant development requires nitrogen, phosphorus, sulfur, magnesium, calcium, potassium, and iron. In the 20th century it was discovered that nutrient mixtures must also contain trace elements, including manganese, boron, copper, zinc, cobalt, and nickel. One of the first nutrient solutions, Knop’s solution, was prepared in 1859 by the German agrochemist W. Knop and is used in water cultures. Per liter of water, it contains 1 g Ca(N03)2, 0.25 g KH2P04, 0.125 g KCl, 0.25 g MgS04, and either traces of FeCl3 or a small quantity of freshly precipitated FeP04. In 1883 the German scientist H. Helriegel suggested using the same salts, but in different proportions and in smaller concentrations. Per liter of water or kilogram of sand, Helriegel’s solution contains 0.492 g Ca(N03)2, 0.136 g KH2P04, 0.075 g KCl, 0.06 g MgS04, and 0.025 g FeCl3; it is used mainly for sand cultures.

A disadvantage of both these solutions is the instability of the pH, which is due to uneven absorption of the cations and anions in the salts over the course of the plant’s development. For normal plant development the pH of the solution should be neutral or slightly acidic. When growing plants on these solutions, pH must be systematically checked and brought to the required level by adding acid, for example, H2S04, or base, for example, NaOH.

From 1900 to 1926, D. N. Prianishnikov worked on finding solutions with more stable pH; he proposed adding buffering salts to the nutrient solution. In his laboratory he produced solutions with relatively stable pH that varied within a specified, narrow range during the entire growth period in permanent water cultures. For example, a nutrient solution that maintains a pH of 5 includes, per liter of water, 0.334 g NH4NO3, 0.166 g KNO3,0.70 g Ca3(PO4)2, 0.25 g Fe2(SO4)3, 0.614 g KCl, 0.50 g MgSO4 · 7H20, and 0.50 g CaS04.2H20. This nutrient solution is considered the best for growing wheat, barley, buckwheat, soy, rye, millet, corn, sorghum, and oats; it is unsuitable for peas and flax.

References in periodicals archive ?
Singh claimed that he grew around 15 kg vegetables in just three months with the help of a nutrient solution which helps the vegetables to grow.
In the first experiment, the level of nutrient solution in the reservoir, which decreased according to the water consumption by plants, was replenished with the respective saline water used to prepare the nutrient solution, and in the second experiment, with water from the local supply system.
In this way, the use of simpler artificial means, such as cultivation in nutrient solution, allows better control of nutrient proportions and evaluation of plant nutrition (FRANCO & PRADO, 2006).
In this perspective, the crops without soil, which consists of cultivating the plants with roots entirely or partially immersed in a nutrient solution, appear as reliable alternatives.
Plants with uniform size were selected, rinsed with deionized water and placed into nutrient solution for 2 days to achieved starvation induces maximal uptake response.
All you have to do is plug in the pre-seeded net pods, insert the nutrient solution, add some water to the hydroponic reservoir and select a plant algorithm using the simple-to-use, educational companion app: Herbot OS.
Nutrient solution bags, also running low, are needed for far fewer patients than saline, but there are few substitutes, said Connie Sullivan, head of research and innovation at the National Home Infusion Association.
The soilless system refers to plant cultivation techniques without the use of soil by providing artificial solid material or water nutrient solution as a growing medium instead of soil.
Hydroponic grow systems fall into two basic categories: water culture where plant roots grow in a nutrient solution, or an inert system where the roots grow into a medium.
While aquaculture is a closed-loop system of fish wastewater being recycled to feed plants, hydroponics instead relies on a store-bought nutrient solution to feed crops.
All the nutrition comes from the nutrient solution that is made by mixing proportionate amount of water and fertilizer.