ABSTRACT
Neste trabalho, objetivou-se avaliar os efeitos de omissões de nutrientes na produção de matéria seca e nos parâmetros de crescimento do bastão-do-imperador. O trabalho foi realizado em casa de vegetação da área experimental do Departamento de Ciência do Solo da Universidade Federal de Lavras (Lavras, MG), no período de janeiro de 2007 a janeiro de 2008. O delineamento experimental foi inteiramente casualizados com quatro repetições e oito tratamentos: Solução Hoagland & Arnon completa, soluções nutritivas com as omissões de N, de P, de K, de Ca, de Mg, de S e de B. Foram avaliadas a altura das plantas, diâmetro das hastes, número de hastes, número de folhas por hastes e volume da raiz. Posteriormente, as plantas foram divididas em folhas, hastes, rizoma e raiz para determinação da massa de matéria seca de cada parte. A omissão de nutrientes afetou os parâmetros de crescimento das plantas e a produção de matéria seca. Observou-se que o bastão-do-imperador mostrou-se mais exigente em B, K, N, P e S na fase inicial de crescimento do que em Ca e Mg. A redução da matéria seca total das plantas foi influenciada na seguinte ordem: B > K > N > P > S > Mg > Ca.
The objective of this work was to evaluate the effect of simple and multiple nutrient omissions on the dry matter production and growth parameters of torch ginger plants. The experiment was carried out under greenhouse conditions at the Soil Science Department of Federal University of Lavras (Lavras-MG). The experiment was started in January 2007 and lasted for 12 months, following a completely randomized design, with four replicates and eight treatments: Complete Hoagland & Arnon nutrient solution, and nutrient solutions without N, P, K, Ca, Mg, S, and B. Plant height, stem diameter, number of stems, number of leaves per stem, and volume of root were evaluated. Subsequently the plants were divided into leaf + pseudostem, rhizome, root and tillers for dry matter determination. The nutrient omissions affected the growth parameters and dry matter production. It was observed that torch ginger is more demanding in B, K, N, P and S at the initial phase of growth rather than in Ca and Mg. The reduction of the total dry matter weight of the plants was affected in the following order: B> K> N> P> S> Mg> Ca.
ABSTRACT
Objetivou-se, neste trabalho, estudar os efeitos de diferentes soluções nutritivas aplicadas em duas vazões na produção hidropônica da alface (Lactuca sativa), cultivada pelo sistema NFT (Nutritive Film Technique). O experimento foi conduzido em casa de vegetação, na unidade de pesquisa em agricultura irrigada da Universidade Estadual de Maringá. Os tratamentos constaram de três soluções nutritivas com concentrações diferentes (S1=0,8 dS/m, S2=1,2 dS/m e S3=2,5 dS/m), combinadas com duas vazões de aplicação (V1=0,8 L.min-1 e V2=1,2 L.min-1 ) nos canais de cultivo em esquema fatorial 3 x 2. Para avaliar o efeito dos tratamentos no desenvolvimento da cultura os dados foram submetidos à análise de variância (teste F), e os resultados avaliados através de teste de média de Tukey (5 por cento). A análise dos resultados permitiu concluir que os fatores solução e vazão não apresentaram interação significativa e que os maiores valores avaliados de biomassa fresca e diâmetro do caule foram obtidos no tratamento solução 2 (CE= 1,2 dS/m).
The porpose of this work was to study the effect of different nutrient solutions applied in two outflow in the hidroponic yeld of lettuce (Lactuca sativa). This research was accomplished at greenhouse through hydroponic system NFT in Maringá State University. The treatments consisted of three nutrient solutions (S1=0,8 dS/m, S2=1,2 dS/m e S3=2,5 dS/m) combined with two flows of application (V1=0,8 L.min-1 e V2=1,2 L.min-1 ) in the growing channels of cultivation. The flows of application of the solutions were 0,8 L.min-1 (V1) and 1,2 L.min-1 (V2), placed alternately in the growing channels in a 3 x 2 factorial scheme. To evaluate the effect of treatments on the culture development the data were submitted to the variance analysis (Test F), and the results were evaluated through Tukey (5 percent) average test. The analysis of the results allowed to conclude that the factories nutrient solution and flow did not show significant interaction. The greater values evaluated of biomass fresh and diameter of stem by plant were obtained in treatment solution 2 (EC= 1,2 dS/m).
ABSTRACT
OBJECTIVE:To investigate the effect of electrolytes on the stability of the total parenteral nutrient(TPN) solutions.METHODS:The pH values and number changes of solution microparticles of 4 groups of TPN sample solutions that of different electrolytes were determined at 0h after preparation and 4 hours,8hours,12hours,16hours and 24hours,respectively after storage under room temperature(20℃～22℃). And the appearances of which were observed under naked eyes. RESUL_ TS:No changes were noted as for the pH of 4 groups of solutions within 24h.For the numbers of microparticles(≥5?m),those in Group 4(to which group valence 1 and valence 2 electrolytes were added) showed a rapid increase to peak value from the very start;while those of the other groups increased with the extension of storage time.Stratification appeared in Group 3(to which group,valence 2 electrolytes had been added) and Group 4(to which group,valence 1 and valence 2 electrolytes were added) 6 hours after preparation.Curdling reaction was noted in Group 2(to which group,valence 1 electrolytes had been added) at 12th hour.Neither sediments nor stratification appeared in Group 1(no electrolytes were added to which group).CONCLUSION:El_ectrolytes have certain influences on the stability of the TPN solutions.Care should be taken to the dosage of which at preparation.Furthermore,once prepared,the solution should be infused as soon as possible and the storage of which should not beyond 24h.