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Studies on the fertilization management of head lettuce(Lactuca sativa var. capitata L.)in winter season in the central part of Taiwain.
|關鍵字:||head lettuce;結球萵苣;Fertilizer management;nitrogen movement;nitrification;肥培管理;養分移動;硝化作用;塑膠覆蓋||出版社:||土壤環境科學系||摘要:||
The head lettuce is used for food very command in the whole world now,and the major production area is U.S.A. April to November to abound with one. Because climate and soil condition are good from October to April of next year in the middle part of Taiwan, it is produced high quality haed lettuce , it is stagger season to produce with U.S.A. to have, have great potentiality for export. But there is no correctly and suitable fertilizer management for Taiwain now, head lettuce quality. It is need to set up the clear and rational way of applications.
In the studt, the first part of experiment was master to the field without plastic mulch, used four level nitrogen (120 (TN120 ) , 170 (TN170 ) , 220 (TN220 ) , 270 (TN270 ) kg/ha ) to know the effects of the difference stage of head lettuce growth in Yun Lin. The nitrogen and phosphorus concentration of plant was higher in the earlier stage. The head lettuce biomass accumulation of earlier stage was slower then the later stage and the nitrogen and phosphate concentration changed lower with the growth stage getting longer. The four treatment production wae 1520 g/plant , 1480 g/plant, 1550 g/plant, 1710 g/plant respectively, and there was no effects of the production of the different fertilizer level. Used the basic of highest uptake of nitrogen treatment(TN220) nitrogen , phosphorus and potassium was 1.58 , 0.20 and 1.78 g/plant respectively for calculating the suitable fertilizer application. The second part experimental was in Taichung, adopt complete random design used the same amount of applications N-P2O-K2O (160-85-166) under plastic mulch field to compared the different to application. Used three kinds of fertilizer , the organic fertilizer(3.5-2-2 ) , organic compound fertilizer (10-4-7 ), chemical fertilizer (16-8-16 ), designed eight kinds of treatment
: (1) organic fertilizer mixed and construct (TOM ); (2) organic fertilizer band(TOB ); (3)The organic fertilizer used difference time(TOS); (4)
organic compound fertilizer mixed(TCM); (5)Organic complex fertilizer band(TCB ); (6)organic complex fertilizer used in difference time(TCS); (7)The chemical liquid fertilizer (TLS ); (8)no application fertilizer(TBK)
; the treatment organic banded could be reached the largest production; the organic complex fertilizer mixed could be reached the largest production.
The result of the incubation experimental was designed the low (100mg N/kg) and high (200mg/kg) nitrogen amount with the urea nitrogen source. After the urea was hydrolysised, in the treatment of low nitrogen amount, different soil got different nitrification rate the Siluo soil on the fourth day and the the Huwei soil on the ninth day had highest mineral nitrogen. In the treatment of high nitrogen the Siluo soil on the ninth day and the Huwei soil on the 14th day had highest mineral nitrogen . It showed that different nitrification rate but the rate could be offer enough on the growth of head lettuce. And the different amount of nitrogen of soil would be changed the nitrification rate.
In addition, the result of the experimental of column showed that during the experimental time the 5th day , 10th days and 15th days, there was no nitrogen moved upon the soil column surface, and the treatment added nitrate nitrogen and urea showed that there was nitrate nitrogen moved upon to the soil column surface; from the result that application in the Irrigation canals and ditches would take placed on the denitrification, when it got irrigation water. And nitrate nitrogen and urea fertilizer could lengthen this reaction time of taking place, but it would be take place . It means the application way is not suitable fertilizer management for growth the head lettuce in Taiwan.
|Appears in Collections:||土壤環境科學系|
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