Plant growth regulators (PGR) are more commonly used to reduce the risk of lodging in lush crops, and are also an important tool to assist root growth and control grain crop separation.
And this spring, many crops are struggling after a wet winter. This is a good example of when growers will benefit from the correct and tactical use of these products.
Dick Neale, technical manager of Hutchinsons, said: “This year the wheat crop is everywhere.
“Any crop planted from September and early October may be considered normal in terms of its plant genetic resources plan, with the focus on reducing lodging.”
People usually think that plant genetic resources will produce more points, but this is not the case. Neal said that the split iller is related to tobacco leaf production, which is related to heat time.
If crops are not sown until November and are sown effectively in December, their thermal time will be reduced to produce leaves and dividers.
Although no amount of growth regulators will increase the number of fractions on the plant, they can be used in combination with early nitrogen to keep more fractions harvested.
Similarly, if the plant’s sub-till buds are ready to burst, PGR can only be used to promote its growth if the sub-bud buds do exist.
The most effective way to do this is to balance out ers by suppressing root dominance and creating more root growth, and PGRs can be used early (before growth stage 31).
However, Mr. Neale suggested that many PGRs cannot be used before growth stage 30, so please check the approval on the label.
For barley, its effect is the same as that of wheat at growth stage 30, but it is important to pay attention to the growth rebound of some products. Then at the age of 31, he took a higher dose of hexanedione or trinexapac-ethyl, but without 3C or Cycocel.
The reason is that barley always bounces back from Cycocel and may cause more lodging when using chloropyri.
Then, Mr. Neale will always use 2-chloroethylphosphonic acid-based products to complete winter barley in the 39th phase of growing barley.
“At this stage, barley is only 50% of its final height, so if it grows a lot later, you may be caught up.”
The direct use of trinexapac-ethyl should not exceed 100ml/ha to achieve good control of the ergonomics, but it will not regulate the stem elongation of the plant.
At the same time, plants need a certain dose of nitrogen to grow, grow and balance.
Mr. Neale suggested that he himself would not use paraquat in the first PGR subtill manipulation application.
Entering the second phase of application of plant genetic resources, growers should pay more attention to the growth regulation of stem growth.
Mr. Neale warned: “This year, growers will need to be careful because when the wheat drilled that night wakes up, it will continue.”
Three leaves are likely to reach growth stage 31 instead of 32, so growers will need to carefully identify the leaves that appear in growth stage 31.
Using the mixture in the growth stage 31 will ensure that the plants have good stalk strength without excessively shortening them.
He explained: “I would use protohexanedione, trinexapac-ethyl, or a mixture containing up to 1 liter/ha of cypermethrin,”
Using these apps will mean that you are not overusing it, and PGR will regulate the plant as expected, rather than shorten it.
Mr. Neale said: “However, please be sure to keep a product based on 2-chloroethylphosphonic acid in the back pocket, because we are not sure what the next spring growth will be like.”
If there is still moisture in the soil and the weather is warm, and the growth time is long, late harvest crops may take off.
If the plant grows faster in moist soil, it can be applied later to solve the increased risk of root lodging
Neal said that no matter what the spring weather, the root system of late planting crops is smaller.
The biggest risk this year will be root lodging rather than stem lodging, because the soil is already in a poorly structured state and may be around the supporting roots.
This is where the power to the stem is essential, which is why Mr. Neale recommends using PGR only mildly this season.
He warned: “Don’t wait and then spend your money.” “Plant growth regulators are just that-shortening the straw is not the main goal.”
Growers should assess and consider whether there are enough nutrients under the plants to be able to maintain and manage them simultaneously.
Plant growth regulators (PGR) target the hormonal system of plants and can be used to regulate plant development.
There are many different chemical groups that affect plants in different ways, and growers always need to check the label before using each product.
“Growers do need to check the label, because a lot of changes have already taken place. Some variants can’t be used until the 31st growth stage, while others cannot exceed 31, while others may have to wait until the 39th growth stage. To stop using it.
He said: “Paraquat reacts slowly in the factory, essentially slowly opening the brakes, but once the brakes are released, they will completely fail and rebound.”
“They can work in colder conditions than cypermethrin, and they work faster, but they degrade much slower, resulting in less rebound.”
Trinexapac-ethyl and protohexanedione help to form thick cell walls, so the plant gets denser and thicker stems. These are also effective in crops as low as 5-6C.
Chloroethyl phosphonic acid is the active ingredient of Terpal and Cerone, but Terpal is also mixed with mesochlor, which means that growers should be cautious when using it.
“I do not recommend using more than 0.4 liters/ha of Cerone, which is equivalent to 1 liter/ha of Terpal.
“It affects the growth of the upper stem, and the window of opportunity is narrow-between growth stages 39 and 45.
“Therefore, especially in winter barley, growers need to be careful not to wait too long and miss the latest growth stage.”
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