How to calculate the leaf age of rice and how to calculate the basic rice seedlings?

The main methods commonly used are as follows:

Grain direction method: According to the principle that rice is 1 2 leaves, it is more accurate to use this method in the early growth stage of rice, that is, one side of rice seed grain is a singular leaf, and the opposite side is a double leaf.

The specific method is to pinch the seed grain and pull it out when pulling out the seedlings, wash off the soil, and the leaf age value at that time can be judged by the singular leaves on one side of the seed grain and the double number of leaves on the opposite side.

Double-zero leaf method at tillering stage: when transplanting N leaves, N leaves and N+1 leaves are double-zero, and the upper leaves are ...... N+2, N+3, and N+4 leaves.

Phytochemical method: when the N leaf is transplanted, the N+2 leaf is planted, and the upper leaf is the N+3, N+4 leaf .......

Main leaf vein method: the tip of the leaf is upward, and the leaf is observed head-on, the main leaf vein is on the right, the left is wide and the right is narrow for the singular leaf, and the double leaf is opposite.

Deformed leaf sheath method: The first deformed leaf sheath between the four elongated internodes is the penultimate fourth leaf.

The longest lobe method: the longest lobe is the penultimate third lobe, and the upper one is the inverted second lobe and the inverted one lobe.

Rice leaf age refers to the number of leaves produced by the main stem, for example, if the main stem grows 7 leaves, the leaf age is 7. If the length of the 8th leaf is half the length of the 7th leaf, the age of the leaf can be recorded. To determine the leaf age of the main stem, it must be recorded from the seedling stage, generally recorded from the first complete leaf, and the fixed plant is marked with the next leaf.

Here's the information Let's take a look at it, and it's a good summary.

1. Rice planting or planting density. The five-point sampling method was adopted, and 1-2 square meters were taken from each point, and the density of the unit area was investigated, which was converted into the number of holes (holes) per square meter.

2. Measure the number of seedlings planted in each hole (stem) of rice.

3. Convert the tour answer to the basic seedlings per mu:

Calculation formula: basic seedlings per mu = the number of holes per square meter * the number of seedlings planted in each hole (roots).

<> arthropod carrying age is an important diagnostic period in the process of rice cultivation, which plays an important role in controlling the basal internode elongation of rice, regulating rice populations, and making decisions on fertilizer and water management in the middle and late stages. According to the internode elongation relationship of the n-lobe (heart lobe) protrusion = n-2 lobe, and the gross difference between the leaf elongation and the internode elongation is 2 leaf positions, it can be found that no matter how many internodes are elongated in the calendar, the leaf age at the jointing stage is the reciprocal leaf age of the number of elongated internodes minus 2 (n-2).

1. Rice planting or planting density. The five-point sampling method was adopted, each point was taken 1-2 square meters, and the density of the unit area was investigated, which was converted into the number of points (蔸) holding the letter and Zen per square meter.

2. Measure the number of seedlings planted in each hole (stem) of rice.

3. Convert to basic seedlings per mu:

Calculation formula: basic seedlings per mu = the number of dust square meters per square meter hole (蔸) * the number of seedlings planted per hole (蔸).

(1) Grain direction method.

According to the principle that the leaves of normal rice are all symbiotic, one side of the grain tip has a singular leaf, and the opposite side has a double leaf.

2) Leaf stretching method.

Rice often grows together with several leaves below it when it emerges, and the exposed tip of the N leaf = the elongation of the leaf sheath of the N leaf = the elongation of the leaf sheath of the N 1 = the differentiation of the leaf tissue of N 2 = the beginning of the differentiation of the leaf tissue of the N 3 leaf = the primordium differentiation of the N 4 leaf. Therefore, if there is an external adverse effect on the tip of a leaf when it is exposed, it will affect all the leaves in the growing area, but the leaf with the greatest impact is the N2 leaf. For example, the age of the leaves at the time of transplanting is leaves, and the seventh leaf growing in the field is generally smaller than its upper and lower leaves.

3) Main lobe vein method.

Turning the tip of the leaf upward, the leaf is observed from the front, the main leaf vein is to the right, the left is wide and the right is narrow, and the double leaf is the opposite.

According to the law of co-extension of rice organs, the growth process of rice main stem and leaves is used to determine the growth period of rice and the corresponding "promotion" and "control" measures of high-yield cultivation technology and fertilizer and water management.

The leaf age pattern of rice is mainly used in the following aspects in production: establishing leaf age observation points and grasping the leaf age process; According to the principle of leaf age pattern, the improvement of key measures is carried out; With the leaf age pattern as the core, a cultivation technology system suitable for the local leaf age pattern was established. Master the field diagnosis technology of leaf age pattern through technical training.