The leaves are important organs for plant growth and development. The condition of leaf gluten in the leaves has a certain influence on the growth and yield of the crop. For this reason, a series of measures are often taken during crop cultivation to treat the leaves of crops in order to ensure the yield and quality of crops. The purpose of the late-maturing sorghum cutting measures is also here. The leaf cutting work has a certain influence on the leaf area, and the leaf area analyzer can be used to measure the leaf. The leaves at different leaf positions were cut at the beginning of earing, and the leaves were cut from the flag leaf to the first 1D leaves. Set the following nine treatments: No cutting, cutting the first leaf (flag leaf) and the second leaf, cutting the 3rd and 4 leaves, cutting the 5th and 6th leaves, cutting the first 1, 2, 3, 4 Leaf, 3â„4 shearing 1, 2, 5, 6 leaves, ¿ Cut the 3rd, 4th, 5th, and 6th leaves, cut the i, 2, 3, bow, 5, 6 leaves, Ã1. All leaves are cut off and the leaf area is determined. The leaf area meter must be accurate.
The leaf weight and leaf area were investigated at the beginning of the earing period, and the dry weight, yield and yield components of the shoot were investigated during the mature period. Using the yield of no leaf-cutting area as 100, the following formula was used to calculate the effect rate of different leaf positions on grain yield, which was expressed as the average value of the difference in grain yield between the two treatment areas associated with this leaf. The remaining leaf weight of each treated plant was as follows. The 3rd and 4th leaves were cut in 67.8% of the leafless area. The residual leaf weight of the first and second leaves was 82.9%. With the upper six leaves completely cut off, the residual leaf weight was sharply reduced to 24.8%. The leaf area of ​​each treatment area was measured using a leaf area meter, and the change of leaf area was basically the same as the change of leaf weight.
The smaller the general residual leaf weight, the lower the grain yield. From the relationship between the removal of different leaf positions and grain yield, when cutting two leaves, the output of the 3rd and 4th leaves was 82.8% of the non-cut leaves, and the 5th and 6th leaves were cut off. Yes, there is little impact on grain yield. When the upper four books were trimmed, the grain yield was reduced by 34.1%, which was slightly higher than the sum of cuts (31.6%) of the first, second leaves and the third and fourth leaves. The yields of cutting more leaves were higher than the sum of cutting yields of some crops. The yield of all the crops that were cut off from ten leaves of the soil was only 14.3% of that without cutting. This yield is converted from pre-heading storage carbohydrates.
The yield per unit leaf weight in each treatment area generally decreases with the increase of residual leaf weight. When the upper leaves remained, the yield per unit of leaf weight was higher. The relationship between the yield per unit area of ​​residual leaf and the residual leaf area is basically the same as above. The effect of leaf cutting on the 1000-grain weight and the number of seeds per plant was the same as that on grain. That is, the larger the leaf weight was, the greater the impact on 1000-grain weight and the number of seeds per plant was, but the impact on 1000-grain weight was not as great as that on grain yield. . The effect rates of different leaf positions on grain yield were as follows: the 3rd and 4th slices and the 1st and 2nd slices were as high as 25.5% and 21.6% respectively, while the 5th and 6th leaves were decreased to 7.25%, and the 7th leaf was lower (Four The total number of leaves is 28,2%.
Through the leaf area tester, it was found that most of the sorghum grain yields were reduced by shearing leaves at the beginning of ear cutting, but the degree of grain reduction was different with the decrease of leaf area and leaf weight. The role of the blades in different positions is different. Although the leaf area and leaf weight of the first and second leaves were smaller than those of 5 and 6 leaves, the effect on yield was significant. This may be due to factors such as light quantity, leaf age, and nitrogen concentration that promote photosynthesis and photosynthate production. To the ear of the transportation.
The leaf weight and leaf area were investigated at the beginning of the earing period, and the dry weight, yield and yield components of the shoot were investigated during the mature period. Using the yield of no leaf-cutting area as 100, the following formula was used to calculate the effect rate of different leaf positions on grain yield, which was expressed as the average value of the difference in grain yield between the two treatment areas associated with this leaf. The remaining leaf weight of each treated plant was as follows. The 3rd and 4th leaves were cut in 67.8% of the leafless area. The residual leaf weight of the first and second leaves was 82.9%. With the upper six leaves completely cut off, the residual leaf weight was sharply reduced to 24.8%. The leaf area of ​​each treatment area was measured using a leaf area meter, and the change of leaf area was basically the same as the change of leaf weight.
The smaller the general residual leaf weight, the lower the grain yield. From the relationship between the removal of different leaf positions and grain yield, when cutting two leaves, the output of the 3rd and 4th leaves was 82.8% of the non-cut leaves, and the 5th and 6th leaves were cut off. Yes, there is little impact on grain yield. When the upper four books were trimmed, the grain yield was reduced by 34.1%, which was slightly higher than the sum of cuts (31.6%) of the first, second leaves and the third and fourth leaves. The yields of cutting more leaves were higher than the sum of cutting yields of some crops. The yield of all the crops that were cut off from ten leaves of the soil was only 14.3% of that without cutting. This yield is converted from pre-heading storage carbohydrates.
The yield per unit leaf weight in each treatment area generally decreases with the increase of residual leaf weight. When the upper leaves remained, the yield per unit of leaf weight was higher. The relationship between the yield per unit area of ​​residual leaf and the residual leaf area is basically the same as above. The effect of leaf cutting on the 1000-grain weight and the number of seeds per plant was the same as that on grain. That is, the larger the leaf weight was, the greater the impact on 1000-grain weight and the number of seeds per plant was, but the impact on 1000-grain weight was not as great as that on grain yield. . The effect rates of different leaf positions on grain yield were as follows: the 3rd and 4th slices and the 1st and 2nd slices were as high as 25.5% and 21.6% respectively, while the 5th and 6th leaves were decreased to 7.25%, and the 7th leaf was lower (Four The total number of leaves is 28,2%.
Through the leaf area tester, it was found that most of the sorghum grain yields were reduced by shearing leaves at the beginning of ear cutting, but the degree of grain reduction was different with the decrease of leaf area and leaf weight. The role of the blades in different positions is different. Although the leaf area and leaf weight of the first and second leaves were smaller than those of 5 and 6 leaves, the effect on yield was significant. This may be due to factors such as light quantity, leaf age, and nitrogen concentration that promote photosynthesis and photosynthate production. To the ear of the transportation.