Soursop seedlings: biomasses and biometric relations in different farming environments and substrates – Part II

Abstract

ABSTTRACT: The quality of seedling is critical to obtain vigorous plants in the field. The present study aimed to assess biomasses and biometric relations of soursop seedlings. We used different substrates in protected environments. The experiment was performed at the Universidade Estadual do Mato Grosso do Sul (UFMS) (State University of Mato Grosso do Sul). Five farming environments were developed in greenhouses: one covered with low-density polyethylene film (LDPE), another with with polyethylene and heat-reflective cloth under film under 50% shading in aluminized color, monofilament cloth under 50% shading in black, thermo-reflective cloth under 50% shading in aluminized color, and an environment covered with bacuri coconut straw. Substrates were made of manure, humus, cassava branches and vermiculite at different proportions. Each of them varying from 25%, 33.3%, 50% and 75% in mixture combination. Each environme nt was considered an experiment. A completely randomized design was adopted and later a joint analysis of them. Agricultural greenhouse covered with LDPE and thermo-reflective cloths under 50% of shading, proportionated seedlings with greater biomass. Substrates containing manure are the most suitable for soursop seedlings. High percentages of earthworm humus produce low quality soursop seedlings. Soursop seedlings had a Dickson's quality index around 0.335. The greenhouse covered only with LDPE film did not produce high quality seedlings.

Fast pyrolysis biochar in eucalyptus seedling production

“…Based on these characteristics, biochar has a great potential as a component of seedling substrates. [2][3][4][5][6] However, appropriate substrate for rooting depends on the type of biochar (technology production, temperature, time retention and others) and species of seedlings, propagation system and availability of components. It is worth remembering that some questions remain about the utility of biochar as a soil/substrate amendment, such as the toxicity and salinity of its leachate, pH effect on nutrient bioavailability and addition rates.…”

Tetranychus mexicanus (Acari: Tetranychidae) IN SOURSOP SEEDLINGS IN THE STATE OF MATO GROSSO DO SUL, BRAZIL

“…Seedling production is a fundamental phase to obtain uniformity of soursop plants (Costa et al, 2016). At this stage of production, the type of substrate, production environment, irrigation, fertilization, and correct phytosanitary management provide conditions for obtaining high-quality seedlings, ensuring success in the development of plants in the field (Costa et al, 2015).…”