Ya Of Houttuynia Need Fertilizer Characteristics And Soil Testing And Fertilizer Research

Nutrition characteristics of Houttuynia Cordata Thunb. called 揕ushan breed?that grew mainly in Yucheng section of Yaan city at present were studied primiparously,feasibility of soil and fertilizer of the planting base of Houttuynia Cordata Thunb. were analysed and assessed,and with this understanding ,soil testing and fertilizer recommendation in the planting base of Houttuynia Cordata Thunb. in Yucheng section of Yaan city were discussed.The results were following: (1) Houttuynia Cordata Thunb. is a typical kind of plant that likes K and N,but isn't sensitive to P 100 kg dried stems and leaves of Houttuynia Cordata Thunb. absorb averagely N 2.2Okg,P205 O.93kg,K20 5.2 lkg,the ratio of N: P205: K20 is 1:0.42:2.37; 100 kg dried underground stems of Houttuynia Cordata Thunb. absorb averagely N 1.lSkg,P205 0.65kg,K20 2.78kg,the ratio of N: P205: K20 is 1:0.57:2.42. From Mar. to May Houttuynia Cordata Thunb. grows tardily and absorbs a spot of N,P and K;From May to Aug. it grows vigorously ,and the quantity of N,P and K absorbed in this period increases continually,but afler Sep.its growth weakens inch by inch, and the quantity of N,P and K absorbed in this period depresses fleetly. (2)The conditions of weather ,soil acid-alkalinity and soil texture of the planting base of Houttuynia Cordata Thunb. in Yucheng section of Yaan city are benefiting to the growth of Houttuynia Cordata Thunb. But NJ?and K nutrition of soil are imbalanceable,the order of lacking degree is 47 N>P>K,now,N and K are primaiy limiting factors of soil nutrient ,the use of nitrogenous fertilizer and potash fertilizer can evidently increase the output of Houttuynia Cordata Thunb.(the feasible dosage of urea is 20kg/mu, the feasible dosage of kalium sulfate is 3Okg/mu);while P isn't a limiting factor of soil nutrient at present,the use of phosphate fertilizer can't increase evidently the output. Methylnonyketone content of Houttuynia Cordata Thunb. may heighten by fersible uses of organic fertilizer . nitrogenous fertilizer phosphate fertilizer and potash fertilizer,but with overmuch use of them output and quality of Houttuynia Cordata Thunb. will reduse.So ti is good to use corporately organic fertilizer(had better not cow dung)and nitrogenous fertilizer, phosphate fertilizer. potash fertilizer with their fersible dosage. (3) When soil testing and fertilizer recommendation are carried into execution ,the lowest dosage of organic fertilizer should be 223 3kg/mu,and N 3.44kg/mu, P205 0.95kg/mu,K20 5.12kg/mu are required;If the needs of N of Houttuynia Cordata Thunb. depend fully on organic fertilizer ,the dosage of excellent organic fertilizer should be 4144kg/mu.Base manure is very important for Houttuynia Cordata Thunb. to mainly use decomposed organic fertilizer and corporately use calcium superphosphate and kalium sulfate (or plant ashes ).During the course of its growth topdressing should be used adequately at the pudding time:after the young plants grow tidily ,30% decomposed human and animals wastes should be used with 2000kg/mu;when stems and leaves are eugonic (from May to Aug.)50% decomposed human and animals wastes should be used two or three times with 2000kg/mu,and with 10kg/mu urea before stems and leaves seal the rows.After the rows are sealed ,0. 1-0.2% KJJ2PO4 solution is sprinlded on the leaves two or three times with 50kg solution per mu.