Theoretical yield: 90 production sites for high-yield acres. For each sample site of 67 square meters, the number of acres per plant was counted. One ear was collected for every five ear sections in each measurement section, and 20 spikes were sampled to determine the number of grains per panicle and the average number of grains per panicle was calculated. Theoretical yield (kg/mu) = acres of harvested panicles The average number of grains per panicle (hundreds of the average of the tested varieties or varieties announcement) 0.85.
Accepted test production: 1. Sampling method. The ten thousand mu demonstration site will be divided into 10 pieces. Each plot will randomly take 3 plots. Each plot will have 6 sampling points and an area of ​​≥ 67 square meters. Each ear was harvested for each sample. Twenty spikes were selected as standard samples to determine the seed emergence rate and moisture content of the fresh ear, and weighed, threshed, and weighed. Measured yield (kg/mu) = Harvested fresh panicle weight Fresh panicle emergence rate (%) Actual area of ​​the harvested sample 666.7 [1-grain moisture content (%)] (1-14%).
One example of a high-yield founder was selected: Zhengdan 958. The output was calculated at five points, each representing 60 mu. The yield per mu was 1 320.6 kg, l 342.8 kg, 1 331.6 kg, 1 269.1 kg and 1 145.8 kg, respectively. The last 5 points averaged 1 282.0 kg per mu. High yield creates a large area of ​​1,342.8 kg of corn per mu. The number of panicles at the 5 production sites was converted to the planting density of 1 mu. The corresponding density per acre is 5330, 5093, 5104, 5265, and 4955 (or spike). Calculated according to this density, the weight of grains per panicle should be above 250 g (half jin). Obviously, anyone who has personally planted the Zhengdan 958 variety knows very well that at such densities it is very difficult for corn to reach a yield of 1,300 kg per mu.
According to the “measurement method†formulated by the Ministry of Agriculture, 10,000 mu of corn is selected at several points, each point is selected at 1 point, and 1 ear is taken from every 5 strains, or the average grain weight of the previous 3 years prevails. Representing more than 100 mu, some representing more than 1,000 mu, some representing 10,000 mu or more, such a conversion, million mu, 100,000 mu, million mu of corn "high-ton food" high yield records were born. No matter how objectively accurate such a method of measurement is, it lacks scientificity and reliability. Try it out, if each site counts 1 more per line, there are hundreds more per acre. If there is a little eagerness for quick success and instant benefit, the artificial error will be even greater.
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