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A technology of density and corn, applied in the field of determining the planting density of corn, can solve the problems of small floor space, limitation of measurement period, etc., and achieve the effect of small floor space, simplified complexity, and overcoming the problems of limitation of measurement period.
Active Publication Date: 2018-09-18
INST OF COTTON RES CHINESE ACAD OF AGRI SCI +1
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[0007] The purpose of the present invention is to provide a method for determining the planting density of corn, which overcomes the limitation of the measurement period when the extinction coefficient method is used to determine a reasonable canopy structure, and aims at the light leakage loss caused by the incomplete completion of the colony before silking and the factors after silking. Issues such as the reduction of group light interception caused by plant leaf aging have been considered; the complexity of the density test is simplified, the floor space is small, and multiple varieties can be tested, and its positive effect can be used for reasonable close planting of crop cultivation. Quantitative determination, promoting research on high-yield cultivation of crops, and providing an effective means for establishing a reasonable high-yield population structure for crops
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Embodiment 1
[0058] Taking the maize variety Zhengdan 958, which has been planted continuously for more than 3 years in the Xinjiang experimental base, as an example.
[0059] The test adopts wide and narrow rows, 0.7m wide row, 0.5m narrow row for planting, 6 rows per plot, plot area 18m 2 , the row length is 5m, the row width is 3.6m, a total of 4 density treatments are set up, and the densities are 1.5, 6, 12 and 18 plants / m respectively 2 , each treatment repeated three times.
[0060] In the silking stage, select a clear and cloudless morning, between 10:00-14:00, adopt the LI-191SA optical quantum instrument produced by the Lincoln Company of the United States to measure the population canopy top (10cm above the tassel) and The photosynthetically active radiation at the bottom (above the aging leaves of the plant) was measured by placing the probe horizontally and perpendicular to the plant to measure the photosynthetically active radiation of the wide row, the narrow row and the th...
Embodiment 2
[0081] Taking the maize variety Xianyu 335, which has been planted continuously for more than 3 years in the Xinjiang experimental base, as an example.
[0082] The test adopts wide and narrow rows, 0.7m wide row, 0.5m narrow row for planting, 6 rows per plot, plot area 18m 2 , the row length is 5m, the row width is 3.6m, a total of 4 density treatments are set up, and the densities are 1.5, 6, 12 and 18 plants / m respectively 2 , each treatment repeated three times.
[0083] In the silking stage, select a clear and cloudless morning, between 10:00-14:00, adopt the LI-191SA optical quantum instrument produced by the Lincoln Company of the United States to measure the population canopy top (10cm above the tassel) and The photosynthetic active radiation at the bottom (15cm above the ground) is measured by placing the probe horizontally and perpendicular to the plant to measure the photosynthetic active radiation of the wide row, the narrow row and the three parts perpendicular t...
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Abstract
The invention relates to the field of crop planting, and particularly relates to a method for determining planting density of corn. The method comprises the following steps: arranging different planting densities of corn, measuring photosynthetically active radiation of the canopy top and the canopy bottom of plants and the leaf area of a single plant in a corn silking stage under different density conditions, and carrying out calculation to obtain measured leaf area index (LAI) values; establishing a relationship model I between the measured LAI values and the planting densities; calculatingthe K values under different density conditions of the corn silking stage by using the Beer's law, and calculating the corresponding LAI values by using the Beer's law again when the light interception rate of each density treatment is 95%, wherein the corresponding LAI values are hypothetical LAI values; establishing a relationship model II between the hypothetical LAI values and the planting densities, wherein the point where the model I crosses the model II is the lower limit of reasonable planting density; and establishing a quadratic function model III between the population yields and the planting densities, and carrying out derivation on the quadratic function to obtain the upper limit of the reasonable planting density. The method provides excellent guidance to reasonable compact planting of corn.
Description
technical field [0001] The invention relates to the field of crop planting, in particular to a method for determining the planting density of corn. Background technique [0002] Appropriate planting density is an important condition for improving crop light energy use efficiency and obtaining high yield. How to establish a suitable planting density and construct a reasonable canopy structure in high-yield crop cultivation has always been a research hotspot. There are two traditional methods: (1) according to the extinction coefficient of the variety; (2) using the density test method. [0003] The extinction coefficient method considers that the extinction coefficient (K) of flat, semi-compact, and compact corn varieties is three fixed values. First, the K value is determined according to the plant type characteristics of the tested variety, and secondly, the corn canopy is calculated using the Beer-Lambert law. When the bottom reaches the optimal light interception rate (9...
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