Significance and methods of thinning male flowers (male flowers) in walnut trees

   walnut has a large number of male flowers, which far exceeds the need for pollination. Male flower bud development needs to consume a lot of water, sugars, amino acids and so on. Removing too many male flower buds from walnut trees is called sparse male. Thinning male flowers can save a lot of water and nutrients for the development of female flowers, thus improving the nutritional conditions in the process of female flower development, improving the yield and quality of nuts, but also conducive to the growth of new shoots and flower bud differentiation, ensuring the yield of the following year. According to the Analysis Center of Chinese Academy of Forestry Sciences, the dry weight of a male flower bud is 0. 5%. 036g, the dry weight increased to 0. 5% when reaching mature inflorescence. 66 grams, weight gain 0. 5%. 624 grams, including 4.3% nitrogen, 1.0% phosphorus, 3.2% potassium, 11.1% protein and amino acids, 4.3% crude fat, 31.4% whole sugar and 11.3% ash. If a walnut tree removes 9o% of the male flower buds, it can save about 50 kg of water and 1. 5% of dry matter. 1-1.2 kg. In a sense, dredging male flower buds is a measure of reverse irrigation and fertilization. Shu Xiong has a very obvious effect on increasing the yield of walnut trees, the fruit setting rate can be increased by 15% to 20%, and the yield can be increased by 12. 5%. 8% 37. 5%.

   in addition, too many male flowers not only consume a lot of nutrients, more importantly, it will cause excessive pollination of female flowers and lead to shedding, affecting nut yield.

The picture shows walnut

The period and method of    's soothing

In principle, the period of    thinning male flower should be early thinning, generally within 20 days before the male flower bud germinating, that is, the male flower bud is the best when the male flower bud begins to expand; in the dormant period, the male flower bud is relatively firm and troublesome to operate, but the effect of male flower bud elongation is not obvious. The ratio of female inflorescence to male inflorescence of walnut is 1: 5: 1, and the suitable amount of male thinning is to remove 90%-95% of the male inflorescence of the whole tree, so that the Prida l: 30-60 of female inflorescence and male flower (floret). However, for trees with scattered and few male flower buds and young trees with just fruit, they can be sparse or not sparse. According to the relevant data, a male inflorescence has 117 ±4 florets, each floret has 26 stamens, 2 anthers, and each locule has 900 grains of pollen, so each male inflorescence has 1.8 million pollen grains. Although the pollen germination rate is only 5% ~ 8%, the male inflorescence left behind can fully meet the needs of pollination. For fine varieties, the male flowers of pollinated varieties should be less sparse, while the main varieties can be more sparse.

When    removes male flowers, pull down the branches with a hook pole with a length of 1m to 1.5m, and then break it off manually or in combination with pruning. Some chemical male thinners are also used, but the effect is unstable.