Nitrogen fertilization in the production of seedlings of Talisia esculenta (A. St. Hil) Radlk

Abstract

A B S T R A C T'Pitombeira' does not have organized cultivation, thus requiring information related to the production of seedlings, particularly in relation to chemical fertilizer. In this context, an experiment was conducted in order to define the best dose of nitrogen (N), using urea as N source, to be applied in 'pitombeira' seedlings. The experimental design was complete randomized blocks with four replicates and ten plants per plot, testing five N doses (0, 400, 800, 1.600 and 3.200 mg dm -3). Data were submitted to analysis of variance and regression. The non-destructive measurements (number of leaves, stem diameter, shoot length and the ratio between shoot length and stem diameter) were evaluated at 30, 60, 90 and 120 days after transplanting (DAT). In addition, shoot, root and total dry matter and Dickson quality index were determined at 120 DAT. Nitrogen fertilizations, from the dose of 500 mg N dm -3 as top-dressing, were those that led to the most vigorous 'pitombeira' plants, while plants developed with dose above 1.600 mg of N dm -3 showed a reduction in their vigor.Adubação nitrogenada na produção de mudas de Talisia esculenta (A. St. Hil) Radlk R E S U M OA pitombeira possui exploração extrativista, sendo uma cultura carente em informações relacionadas à produção principalmente quanto à relação à adubação química. Neste sentido foi conduzido um trabalho com o objetivo de testar a melhor dose de nitrogênio, tendo como fonte a ureia a ser aplicada em mudas de pitombeira. O delineamento experimental utilizado foi o de blocos completos ao acaso com quatro repetições e dez plantas por parcela sendo testadas cinco doses nitrogênio (0; 400; 800; 1.600 e 3.200 mg dm -3). Os dados foram submetidos à análise de variância e regressão. As mensurações não destrutivas (número de folhas, diâmetro do colo, comprimento da parte aérea e a relação entre o comprimento da parte aérea e o diâmetro do colo) foram avaliadas aos 30, 60, 90 e 120 dias após o transplantio; já a massa seca da parte aérea, das raízes e total e o índice de qualidade de Dickson foram determinados aos 120 dias. As adubações nitrogenadas foram, a partir da dose de 500 mg N dm -3 em cobertura, as que proporcionaram formação das mudas de pitombeira mais vigorosas enquanto as plantas desenvolvidas com dose acima de 1.600 mg de N dm -3 apresentaram redução no seu vigor.

Growth, Physiology and Nutrient Use Efficiency in Eugenia dysenterica DC under Varying Rates of Nitrogen and Phosphorus

“…On the other hand, the cultivation of plants at the highest N rate (400 mg dm −3 ) had negative effects on the growth of young E. dysenterica after 278 d of cultivation. Similar behavior in growth and dry mass production was observed at doses higher than 504 mg dm −3 N in Talisia esculenta seedlings [25] and at doses of 200 mg dm −3 N in Annona crassiflora [35].…”

“…As observed for E. dysenterica, mature watermelon plants provided with a high N supply also showed a lower performance in root growth than plants grown under low N conditions [33]. Similarly, previous studies reported that the morphological traits of Talisia esculenta [25] and E. dysenterica [34], particularly height and stem diameter, were not responsive to N doses under controlled conditions. This suggests that this species has low nutritional requirements for N in the earlier stages of development.…”

“…Adequate N and P are important nutrients for the initial development of tree plants [ 25 ]. The N is required throughout plant growth, and N deficiency is considered one of the most limiting factors for plant growth [ 11 , 26 ].…”

Sustainability in Rainfed Maize (Zea mays L.) Production Using Choice of Corn Variety and Nitrogen Scheduling

“…JM 218 and N 5 Ns30RF that produced more values of growth parameter and showed superiority over other treatments, which might have brought significant differences under these (JM 218 and N 5 ) treatments. Appropriate N management caused significant effect on plant height, root length, stem diameter, shoot dry matter and total dry matter which resulted in higher DQI value [58,59]. According to Dias et al [60] suitable cultivar selection, better management of nitrogen, and increasing nitrogen doses have produced higher values of DQI.…”