Higher quality planting is essential to achieving an excellent productivity result, as it is the most important stage of the cycle in terms of investment and yield potential. Among the requirements for optimum planting is the ability to deposit seeds accurately, in terms of spacing and depth. Accordingly, plants tend to grow and develop without competition for light, water, and other nutrients, managing to reach maximum levels of productivity.
The four basic agronomic principles
There are basic principles for obtaining quality planting:
- Make a "V" shaped furrow with perfect walls
“V” shaped furrow
- Distribute seeds one by one with uniform spacing
High accuracy in planting
- Place seeds at the same depth
Excellent depth control in seed placement
- Cover seeds laterally, maintaining soil coverage
Proper seed coverage
Coefficient of variation (CoV)
In addition to achieving the target population, it is necessary to ensure that the seeds are planted with uniform depth and spacing, as well as good soil contact. Even when reaching the desired number of seeds per meter, an inaccurate deposition of the seeds impairs the crop's production potential since a non-ideally planted crop cannot be recovered.
It is possible to measure the uniformity of planting through the failure rates and multiples, using the coefficient of variation (CoV).
According to PIONEER® studies, 25 percent is considered an acceptable CoV
Accordingly, the greater the variation in seed deposition, the greater the CoV. Therefore, it is possible that a smaller variation represents greater productivity. In addition, to maintain production potential, the operator must perform the necessary maintenance and setup of the entire planter.
It is known that the CoV refers to the homogeneity of the distribution of seeds in the soil, therefore the lower the CoV, the greater the uniformity in the spacing between the seeds deposited in the soil.
Singulation is related to the percentage of skips and doubles that occurs when planting. In other words, higher singulation values mean that the defined seed target rate is being attended. Therefore, is it desirable to have a uniform distribution of seeds in the soil, and also to guarantee that the seed target rate is in accordance with what was defined on the planting planning.
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