Wenzhou mandarin oranges are blessed with favorable conditions such as soil and climate, and are cultivated throughout the city. Recently, in order to provide safe, reliable, high-sugar, and high-quality mandarin oranges, mulch cultivation (cultivation method in which the surface of field soil is covered with straw or artificial film. The purpose of mulching is to control the soil temperature control of temperature rise, promotion of temperature rise and heat retention during low temperature period), suppression of weeds, retention of soil moisture, prevention of soil disease by suppressing splashing of muddy water during heavy rain, prevention of soil erosion and fertilizer runoff due to rain, mulching There seems to be an increasing number of producers who use the light reflected from the leaves to promote fruit coloring and control aphids. It seems that Nagasaki’s warm climate and topography are perfect for growing delicious mandarin oranges, with the sea nearby. The mandarin oranges of Nagasaki, which are made with plenty of sunlight, have a certain taste and depth.
From NARO, mulch seems to have both ends of organic mulch such as straw, rice husk, and grass, and artificial film mulch such as polyethylene film. There are various types of polyethylene film mulch, such as colorless transparent type, black type, transparent type colored in green or purple, white type, black and white type on the front and back, aluminum vapor deposition film, aluminum mixed type (silver mulch). The colorless and transparent type has the greatest effect of raising the soil temperature, but it seems that the effect of suppressing weeds is low. The black type blocks almost all the sunlight, so it seems that the effect of raising the soil temperature is low, but the effect of suppressing weeds is high.
Plants breathe like people. They are genuine creatures. However, unlike humans, gas exchange is the inhalation or excretion of oxygen and carbon dioxide in respiration and photosynthesis. In leaves, dark respiration is performed in dark places, and dark and light respiration are performed in bright places for gas exchange. For plants, respiration is essential for using nutrients to produce the energy necessary for metabolism to live. Of course, if you don’t breathe, you will die and eventually wither away. In addition, the body must have the nutrients necessary for breathing. It seems that the respiration of mandarin oranges is measured in the same way as the photosynthesis measurement, using an assimilation box and measuring the concentration difference between the inflow and outflow of carbon dioxide with an infrared carbon dioxide analyzer. Saplings are covered with an assimilation box to determine respiration, but mature trees are so large that they cannot be measured by covering the entire tree. Seems to be asking