A method to accurately calculate the overwintering rate of perennial grasses

Abstract

The invention discloses a method for accurately calculating a wintering rate of perennial gramineous forage grass. The method comprises the following steps: selecting an area, counting the plant quantity before wintering in the plant pre-winter dormant phase, when the revived plant quantity after wintering is up to 10%, counting the wintered plant quantity for the first time, then counting once every ten days, and counting the wintered plant quantity for a plurality of times; using an ecologic logistic equation as a model to perform fitting, in order to calculate the plant quantity at the inflection point within the wintered sample segments, and then obtaining the wintering rate. The method, disclosed by the invention, is to regularly count the plants in the dormant phase before wintering and the reviving phase after wintering for many times according to the growth characteristics and the phenological phase characteristics of the perennial gramineous forage grass, which is suitable for the basic law of plant growth and development, then to use the population growth model logistic equation commonly used for ecology, in order to find the increase inflection point of the revived plant quantity, and further to calculate the plant wintering rate at the time of the inflection point, so as to describe the survival ratio of the wintered plants after reviving more accurately.

Description

technical field [0001] The invention relates to the field of agricultural science and technology, in particular to a method for accurately calculating the overwintering rate of perennial grasses. Background technique [0002] Poaceae forage is one of the essential forages in the production of animal husbandry. It is widely distributed in my country, has a large amount of resources, and is rich in nutrition, easy to process, easy to store and transport, and can also be mixed with other ingredients to make feed for different purposes. , is a favorite food for livestock and poultry. Poaceae herbage has strong resistance to stress, mowing and trampling. It is also an excellent plant for garden greening, windbreak and sand fixation, and water and soil conservation in northern my country. It plays an important role in grassland agriculture and grassland ecosystem. Grasses include wild and cultivated types, which can be divided into annuals, biennials and perennials according to th...

AI Technical Summary

Problems solved by technology

However, most parts of northern my country have a cold climate and less snow in winter, especially in the arid areas of Northwest China, Bashang Plateau of Hebei Province and Northeast China, where the extreme temperature can reach minus 20-40°C. Overwintering brings great challenges. Therefore, how to ensure that the cultivated forage can survive the winter and turn green safely in the cold winter and spring has become a key issue in production practice.

[0003] According to forage cultivation or grassland ecology, the main index to measure the overwintering survival rate of gramineous forages is the overwintering rate, that is, the ratio of the number of surviving grasses per unit area after overwintering and turning green to the number before overwintering. Theoretically speaking, the The definition is the essential meaning of the overwintering rate, and it is also an indicator that is urgently sought for knowledge in actual production. However, it is difficult to obtain this indicator accurately in actual operation. The main reason is related to the growth characteristics of forages. The method is complex, and the number of plants in the whole growth stage is always in a state of dynamic change. That is, when the number of plants is counted, the data recorded at which point in time can become the most representative basic data, which will become the key point and key point for accurate calculation of the overwintering rate. Difficulty, therefore, if there is a method that can accurately determine the time points for counting the number of forage plants before and after overwintering, or in the process of calculating the overwintering rate of perennial grasses, the number of plants is counted in a unified way, then different types of perennial Only effective comparability can exist between the overwintering rate data of grass grasses

[0004] In the Agricultural Industry Standard of the People's Republic of China "Technical Regulations for Grass Variety Approval" (NY / T 1091-2006) promulgated and implemented in October 2006, the description of the overwintering rate of gramineous grasses is "select representative sample sections in the plot Two places, each section is 1m long, and the total number of plants in the sample section and the number of greening are calculated before wintering and after turning green in the second year, and the wintering rate can be counted.” Among them, the specific counting time before wintering and after turning green in the second year is designated Unknown, difficult to operate in the actual measurement, the reason is that the phenology time of perennial grasses is longer before overwintering and after turning green in the second year, especially in the second year turning green, some even reach 1-2 months, during this period, the plants The number has been in a state of change, and the number of plants in the sample period at different time points is different. When counting at different time points, the calculation results are very different, and the overwintering rates obtained between different species or treatments are not comparable. In addition, each If only two samples are taken in the test process, statistically significant differences cannot be analyzed, which again reduces the validity and practicability of the test data