Marília Barcelos Souza Lopes

Produção de feijão-caupi sob estresse hídrico utilizando-se hidrogéis

According to the Food and Agriculture Organization of the United Nations estimations (FAO 2016), food production needs to increase more than 70 %, in order to attend the increasing demand (Cargnin 2007), since the world population is estimated to reach 9.1 billion people up to 2050. Therefore, new management strategies have been researched to stimulate the food production increase, ABSTRACT RESUMO

Adaptabilidade e estabilidade da produção de grão em feijão comum (Phaseolus vulgaris)

Objetivou-se com este trabalho avaliar a adaptabilidade e estabilidade da produtividade de grao de feijao comum, cultivados em seis ambientes, no sul do Estado do Tocantins, Brasil. Os ensaios foram conduzidos com um delineamento estatistico em blocos ao acaso, com quatro repeticoes, em tres entressafras. Para a realizacao das analises de adaptabilidade e estabilidade utilizaram-se as cultivares IAC-Una, BRS-Esplendor, Princesa, IPR-Colibri, IAC-Centauro e Safira. Os metodos utilizados para avaliar a adaptabilidade e estabilidade foram Eberhart e Russell, Centroide e Annicchiarico. Concluiu-se que as metodologias do Centroide, Annicchiarico e Eberhart e Russell, com base na produtividade de graos tornaram possivel a identificacao de cultivares promissoras para ambientes de condicoes gerais e especificas (favoraveis e desfavoraveis). As cultivares IAC Centauro, IAC Una e Princesa sao indicadas para ambientes de condicoes gerais por serem produtivas, com ampla adaptabilidade e estaveis na entressafra.

Fertilizing potassium in rice cultivation in sandy soils of tropical lowland

The rice plant is very demanding in nutrients, with potassium being that the plant nutrient further accumulates, and is essential to many physiological and biochemical processes in the plant. The objective of this study identify appropriate doses of potassium in the culture of rice, grown in sandy soils of lowland tropical rainforest in the state of Tocantins. The experiment was conducted in hydromorphic soil type Gleysol Humic of irrigated lowland, in the Araguaia-TO Formoso region. We used the experimental randomized block design, in a factorial 2 x 5, with four replications, two cultivars (Irga-424 and Irga-423) and five doses of K (60, 90, 120, 150 and 180 kg ha K -1), applied in the form of potassium chloride. Each experimental plot consisted of twenty-seven lines of 15 m in length, spaced 0.17 m between rows. The floor area was composed of the four central lines in the length of two linear meters. The characteristics evaluated were plant height, number of panicles m2, grain yield, weight of hundred grains, potassium content and chlorophyll index. Data were subjected to analysis of variance and regression at 5% probability by F test The cultivaresnao responded to the increased potassium fertilization in sandy soils of tropical lowland; the average yield was reached with the basic fertilization, sedo 6827.42 and 5215.35 kg ha-1 for Irga-424 and Irga-423, respectively.