CN-121986639-A - Corn field density gradient test design method

Abstract

The invention provides a corn field density gradient test design method, which comprises the steps of firstly setting a circular total test area with radius R, a lowest planting density D min and a highest planting density D max according to test conditions and requirements, sequentially setting an inner peripheral blank area, an inner peripheral protecting belt, an effective test area and an outer peripheral protecting belt from the center of a circle to the outside, calculating the radius R of the inner peripheral blank area and the outer peripheral row spacing H R of the effective test area, defining the inner peripheral blank area according to R, defining the effective test area into a plurality of planting rows along the radius direction according to H R , and finally sowing along plant spacing and the like. The invention designs the perfect density gradient with constant plant spacing and gradually smaller line spacing along with the geometric structure by utilizing the geometric structure with wide outside and narrow inside of the ring, and can be widely used for the research of the related theory of close planting of corn and the accurate measurement and calculation of the optimum popularization density of new varieties.

Inventors

• CAO XIAOLIANG
• DU XIONG
• HUANG ZHIHONG
• GAO ZHEN
• LIU GUANGZHOU
• CUI YANHONG
• Bian Dahong

Assignees

• 河北农业大学

Dates

Publication Date

20260508

Application Date

20260127

Claims (7)

1. 1. A corn field density gradient test design method is characterized in that the corn planting field density gradient design is carried out by utilizing an annular geometric structure with wide outside and narrow inside, and the method comprises the following steps: S1, setting a circular total test area with radius of R, a lowest planting density D min and a highest planting density D max according to experimental conditions and requirements, and sequentially setting an inner peripheral blank area, an inner peripheral protective belt, an effective test area and an outer peripheral protective belt from the center of a circle to the outside; S2, calculating the radius R of the inner peripheral blank region, wherein the radius R of the inner peripheral blank region and the radius R of the total test region meet the condition that D min /D max = (r+0.5)/(R-0.5); s3, calculating the peripheral row spacing of the effective test area, namely H R =666.7/(D min multiplied by 0.25); S4, dividing the effective test area into a plurality of planting rows along the radial direction according to the peripheral row spacing H R of the effective test area, and then sowing along the planting row and other plant spacing.
2. 2. The method of claim 1, wherein the inner and outer protective strips each have a width of 0.5 m.
3. 3. The method of claim 1, wherein the inner peripheral void area is a non-seeding area.
4. 4. The method of claim 1, wherein the plant spacing between any two adjacent plants on the same row is constant at 0.25 m.
5. 5. The method according to claim 1, wherein the row spacing (H X ) and the corresponding density (D X ) of the X-th plant from outside to inside on the planting rows in the effective test area are calculated as: H X /H R =(R-0.5-0.25X)/(R-0.5); D X =666.7/（H X ×0.25)。
6. 6. The method of claim 5, wherein each plant in each plant row in the effective test area has different experimental densities and the number of the plant in each single plant is the same, and the calculation formula of the sample size (N) corresponding to the single plant density ring is: N=2π×(R-0.5)/H R 。
7. 7. the method of claim 6, wherein if the density loops of individual plants are of a density gradient corresponding to a sample size insufficient, adjacent plants on the planting row can be combined into a same density group, and the average row spacing of the density loops of several individual plants is equal to ) As the group represents the row spacing, the corresponding density 。

Description

Corn field density gradient test design method Technical Field The invention belongs to the technical field of agriculture, and particularly relates to a corn field density gradient test design method. Background It is known that increasing the planting density is an important way for increasing the corn yield per unit, and is a popular topic in corn research and practical production in recent years. In the field of corn research, field experiments on density differences in research related to planting density are all design layouts based on a few density points. In the practical production of corn, the practical optimum planting density of a new corn variety in a specific popularization area cannot be accurately determined, and various inconveniences are brought to corn scientific research and production. According to the invention, the density test is designed based on the special geometric structure of the ring, and the perfect density gradient can be designed according to the requirement, so that the corn planting density test is more efficient. Disclosure of Invention The invention aims to solve the technical problems of the prior art, and provides a corn field density gradient test design method which utilizes a geometric structure with a wide outside and a narrow inside to realize a perfect density gradient with a constant plant spacing and a row spacing gradually decreasing along with the geometric structure. In order to solve the technical problems, the technical scheme adopted by the invention is that the corn field density gradient test design method utilizes a geometric structure with wide outside and narrow inside to carry out corn planting field density gradient design, and comprises the following steps: S1, setting a circular total test area with radius of R, a lowest planting density D min and a highest planting density D max according to experimental conditions and requirements, and sequentially setting an inner peripheral blank area, an inner peripheral protective belt, an effective test area and an outer peripheral protective belt from the center of a circle to the outside; S2, calculating the radius R of the inner peripheral blank region, wherein the radius R of the inner peripheral blank region and the radius R of the total test region meet the condition that D min/Dmax = (r+0.5)/(R-0.5); s3, calculating the peripheral row spacing of the effective test area, namely H R=666.7/(Dmin multiplied by 0.25); S4, dividing the effective test area into a plurality of planting rows along the radial direction according to the peripheral row spacing H R of the effective test area, and then sowing along the planting row and other plant spacing. Preferably, the widths of the inner protective tape and the outer protective tape are each 0.5 m. Preferably, the inner peripheral blank area is a non-seeding area. Preferably, the plant spacing of any two adjacent plants on the same planting row is constant at 0.25 m. In the invention, the row spacing (H X) and the corresponding density (D X) of the X-th plant from outside to inside on the planting rows in the effective test area are calculated as follows: HX/HR=(R-0.5-0.25X)/(R-0.5); DX=666.7/（HX×0.25)。 In the invention, the experimental densities of each plant in each planting row in the effective test area are different, the number of the plant plants in the density ring corresponding to each single plant is the same, and the calculation formula of the sample size (N) corresponding to the single plant density ring is as follows: N=2π×(R-0.5)/HR。 If the density ring of each plant is a density gradient with insufficient sample size, combining adjacent plants on the planting row into the same density group, and using the average row spacing of the density rings of several plants ) As the group represents the row spacing, the corresponding density。 Compared with the prior art, the invention has obvious technical effects: 1. The traditional field test arrangement is constant row spacing, density control is realized by adjusting plant spacing, but perfect density gradient is difficult to achieve, and the invention realizes constant plant spacing and gradually reduces with geometric construction by designing the geometric construction with wide outside and narrow inside in a ring shape, thereby realizing perfect density gradient. 2. The invention can form perfect density gradient in a very small test area by utilizing the annular geometric characteristic, and can be widely used for the theoretical research of corn close planting correlation and the accurate measurement and calculation of the optimum popularization density of new varieties. The invention is described in further detail below with reference to the drawings and examples. Drawings FIG. 1 is a schematic diagram of the overall design of a corn ring density gradient experiment of the present invention; FIG. 2 is a detailed view of the effective test area of the toroidal density gradient test of corn of t