| In view of a series of agricultural eco-environmental problems,such as the decline of land quality and water pollution caused by the abuse of pesticide and fertilizer in China at present,the agricultural production of eco-environmental protection has become the trend of agricultural development in the future.In the face of these circumstances,the Ministry of Agriculture has put foirward the goal of "double reduction."the goal of "double reduction" is to reduce the use of chemical pesticides and reduce the use of chemical fertilizers,and how to ensure quality under the premise of satisfying the quantity of agricultural products and meeting the market demand.We must start with science and technology.Therefore,in this context,it is necessary to improve the fertilization scheme of agricultural products and find new environmentally friendly fertilizers for crop cultivation.As a natural and environmentally friendly new fertilizer,Seaweed extract can provide all kinds of nutrients and growth factors for crops,and improve soil conditions.This kind of fertilizer also has the advantages of unparalleled increase in yield,resistance to stress,no side effects and other advantages as compared with chemical fertilizers.The application prospect is very broad.Applying it to rice cultivation is of great significance to the increase of rice yield and the improvement of traditional fertilization methods.The experiment was carried out in 2018 in the field of agricultural research base of Guangxi University(early and late two cropping rice).Four different gradients of Seaweed extract,and a control group were set up and the field operation was carried out by mixing fertilizer root at tillering stage of rice.Two varieties of rice,Gui Yu 9(conventional rice)and Gui Liangyou 2(hybrid rice),were used for cultivation.The difference of application effect of Seaweed extract.on different types of rice was studied by comparing the plant growth,yield and other indexes among varieties.Seeking for better application of Seaweed extract in rice cultivation Type.The results of the data analysis obtained in this experiment are as follows:(1)The results of experiment showed that the application of Seaweed extract at tillering stage could increase the yield of rice in different degrees.When 200g/mu of Seaweed extract.was applied,250g of Seaweed extract had the most obvious effect on the yield of early and late season rice.The highest yield increased by 5%,8.4%and 16.6%,11.8%respectively in early and late season rice Guiyu 9,Guiliangyou 2 and Guiliangyou 2,indicating that Seaweed extract had better effect on the yield increase of Guiliangyou 2.(2)The application of Seaweed extract enhanced the nutrient absorption of rice,promoted the increase of tiller number,and increased the tiller ability and dry matter accumulation of rice.(3)The application of Seaweed extract could increase the leaf area index and chlorophyll content of rice,thus improve the photosynthesis ability of rice leaves,and had a positive effect on the increase of its yield.(4)The application of Seaweed extract could increase the yield of rice mainly due to the increase of grain number per panicle,1000-grain weight and seed setting rate at the mature stage.Through the experimental study,the application of Seaweed extract increased the index of leaf area index,tillering number and SPAD of rice,and so on.The results provide a nutritive basis for the increase of panicle and grain fullness of rice in mature stage,and promote the high yield of rice.(5)The yield analysis showed that the thousand-grain weight,the number of the effective ear,the number of each ear and the seed set rate had a positive effect on the yield increase,but the grain structure index of the early-late rice was not consistent with the yield.The most important index for the yield of the early-season rice was the number of grains per spike and the thousand-thousand-grain weight.The most important index for the yield of late-season rice is the number of grains per spike and the seed setting rate. |
PDF Full Text Request