Screening Of Rice Varieties Suitable For Rice Shrimp And Rice Crab Co-cropping And Study On Fertilizer Dosage

Rice shrimp and rice crab co-cultivation is an ecological agriculture model that combines planting and breeding,and complements rice and fisheries.It realizes "one water and two uses,one field and double harvest",which can significantly increase the comprehensive benefits of rice fields and is an effective way to promote rural economic development and increase farmers’ income.Ways to get the focus of local governments.However,technological research is relatively lacking,and there are still many key common technical problems that need to be solved urgently,which restricts the healthy development of the industry.In this study,15 high-quality rice varieties were selected and planted in Henghu Reclamation Farm and Guantian Village,Jinjiang Town,Yujiang County,respectively,To select rice varieties suitable for Jiangxi post-shrimp continuous cropping and rice turtle co-cultivation.At the same time,two rice varieties were selected as materials,and different fertilizer dosage experiments were set up to understand the characteristics of rice growth,yield and quality formation under different fertilizer dosage conditions,and to compare and analyze the effects of different fertilizer dosages on the growth,yield and quality of rice.Provide a basis for a green,ecological and efficient production technology system for rice and fish farming.The main findings are as follows:(1)In the rice-shrimp continuous cropping model,the comprehensive performance analysis of the growth period,yield,rice quality,lodging resistance,and cadmium content of 15 tested rice varieties under direct-seeding cultivation conditions showed that Wanxiangyou 982,Tai Xiangyou Yuesi Miao,Vientiane Youhuazhan,Yexiang Youlisi,Taiyou 398,Hongliangyoumei Tezhan,Yexiangyou Mingyuesi Miao,Yexiangyoubasi have a moderate growth period and high yield potential.It is suitable for medium rice planting in the continuous cropping mode of shrimp and rice.Among them,Vientiane You 982,Taixiang Youyue Silk Miao,and Taiyou 398 have better lodging resistance,Vientiane Youhuazhan,Yexiang Youlisi,Hongliangyouyou Tezhan,Yexiangyou Mingyue Silk Miao,and Yexiangyouba Silk has relatively poor lodging resistance,so care should be taken to enhance its lodging resistance when planting.Jiafengyou 2 has a higher yield,but a longer growth period.From the perspective of stubble connection,it is more suitable for artificial seedling transplanting,but not suitable for mechanical transplanting and direct seeding cultivation.(2)In the rice-turtle co-cultivation model,the comprehensive performance of the 15 tested rice varieties in growth period,yield,pest resistance,lodging resistance,and cadmium content under artificial seedling transplanting conditions was analyzed,and it was shown that Vientiane is excellent 982,Huajing,Hongliangyou,Wanxiangyouming,Yexiangyou Mingyue silk seedlings,Yexiangyoubasi,Jiafengyou 2 have high yield potential,suitable growth period,suitable for rice-and-shelled turtle co-cultivation mode planting.Among them,Wanxiangyou 982,Huajing and Hongliangyoutezhan have better lodging resistance and insect resistance,and Wanxiangyoutezhan,Yexiangyoumingyuesi seedlings,Yexiangyoubasi,and Jiafengyou 2 have better lodging resistance and insect resistance.The insect resistance is poor,and the planting needs to enhance its lodging resistance and strengthen the integrated prevention and control of diseases and insect pests.(3)Under the same fertilization conditions,the rice-shrimp continuous cropping showed a more obvious increase in yield compared with traditional rice monocropping.The two tested varieties Yexiangyou Mingyuesimiao and Nongxiang 42 were compared with monoculture rice.The output increased by 7.06% and 5.47%,and the increase rate reached a significant level.In the rice-shrimp continuous cropping mode with different fertilization rates,the yield of rice decreased significantly with the decrease of fertilization rate,and the yield difference between different treatments was significant.When the fertilization rate was 30% lower than the normal fertilization level,the yield of the two tested rice varieties was 4.50% and 11.54% lower than that of the traditional monoculture rice,respectively;when the fertilization rate was 50% lower than the normal fertilization level,the yield of the two tested rice varieties was reduced by 50%.The yield was 11.61%and 18.34% lower than that of traditional monoculture rice.Rice and shrimp continuous cropping is beneficial to improve soil fertility.Compared with traditional rice single cropping,it has a certain weight loss and synergistic effect,but the amount of fertilization should not be reduced too much.(4)Under the same fertilization conditions,the rice-turtle co-cultivation also showed a significant increase in yield compared with traditional rice monocropping.The two tested varieties Yexiangyou Mingyuesimiao and Huzaoxiangruan compared with single cropping.The production of rice increased by 2.73% and 2.14% respectively,and the increase in yield also reached a significant level.Under the rice-shelled turtle co-cultivation model,the difference in rice yields was also significant between different fertilization rates,and the yield decreased significantly with the reduction of fertilization rates.When the fertilization rate was reduced by 30% compared with the normal fertilization level,the yields of the two tested rice varieties were reduced by 16.22% and 6.61% respectively than that of the traditional monoculture rice;when the fertilization rate was 50% lower than the normal fertilization level,the yield of the two tested rice varieties was reduced by 50%.The yield was reduced by 33.89% and 38.71% respectively compared with the traditional monoculture rice,and the yield reduction rate reached more than 1/3.Rice and turtle co-cultivation has a certain effect on soil fertility,but the amount of fertilization should not be reduced too much.