Robinia pseudoacacia cutting technique in autumn and winter

There are several advantages to planting hedgehogs in the late autumn and early winter: First, to avoid the peak period of spring tree planting and the busy farming season, and make full use of the winter idle period, the quality of planting time is fully guaranteed. Second, according to the physiological characteristics of Robinia pseudoacacia, the daily average temperature needed for root growth is lower, and after the autumn leaves fall, the above-ground part stops growing, while the underground part still grows for a period of time, and when the fallen leaves, the flow and nutrition of the branches and leaves return to the trunk and roots, At this time, the roots are stored rich in nutrients, just in time for the root system to have a growth stage. Thirdly, the plots for planting hedgehogs are generally more arid, and in the late autumn and early winter, they are close to the rainy season. Soil moisture is better than spring, and when they are planted, they are more conducive to the growth of roots, thus improving the survival rate. After the newly planted locust seedlings, the root system has been restored and grown for a period of time before the arrival of severe winter. The late spring cultivar is short and the root system grows immediately after the temperature is suitable, and then sprouts from the rhizome to grow into new shoots. First, planting time: Every year, the leaves are planted as soon as possible after November. Second, the size of seedlings: afforestation of barren hills generally choose seedlings with a diameter of 0.7 cm or more, and greenery with a diameter of more than 2 cm can be selected on all sides. To retain the complete root system, the length of the root system should be no less than 25 cm and the root width should not be less than 20 cm. Third, planting techniques: autumn and winter planting generally used with the method of digging with planting. When digging the hole, separate the top layer of mature soil from the bottom layer. Before planting, it is necessary to trim the roots and remove the rot and roots. The depth of planting is consistent with or slightly deeper than the depth of the seedlings. When backfilling the soil, it must be backfilled with mature soil and then filled with raw soil to achieve “three burials and two stepping and one seedling raising”. Interception can be carried out immediately or 10 days after planting (the stem can be returned to the roots to facilitate root growth) and the cutting height is 2-3 cm from the ground. After cutting, earth is buried well. China Agricultural Network Editor

Polyhydroxybutyrate PHB

PHB is a truly biodegradable and biocompatible plastic and an attractive environmental-friendly alternative to fossil-based thermoplastics such as PE and PP. However, unmodified PHB resin has a relatively high melting point of about 160 to 180 °C and is difficult to process due to its narrow processing window. To improve its processability and mechanical properties, PHB is often blended with plasticizers and other polymers such as polyvinyl acetate (binders), polyvinyl alcohol and polylactic acid (PLA).

Commercial grades of PHB have properties that are very similar to those of polypropylene (PP). Typical applications of PHB are disposable tableware articles like drinking cups, cutlery, trays, food plates and food containers. Some other (potential) applications include soil retention sheething and other agriculture films, waste and shopping bags, and the use as a packaging material in general. PHB can also be spun into fibers which could be used for the manufacture of woven and non-woven biodegradable one-use fabric articles such as surgical sutures (Tepha). Other (potential) biomedical applications include drug delivery systems (microcapsules or microspheres) and biodegradable implanted medical devices.

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