Adubação orgânica e disponibilidade de água no desenvolvimento do capim-elefante cv. Pioneiro

Abstract

The experiment was conducted in a greenhouse in the agricultural sciences department at the Universidade Estadual of Montes Claros (UNIMONTES), campus Janaúba - MG, in a greenhouse. The experiment was conducted in randomized blocks arranged in a factorial 5x2 for the evaluation of 4 doses of organic compound and a control (0, 10, 20, 30 and 40 t ha-1 ) and two water conditions: water comfort (100% field capacity) and water restriction (50% of field capacity), with three repetitions totaling 30 experimental units. Were marked 3 tillers each vessel to determine the morphogenetic and structural characteristics, in addition, it determined the productivity of the dry matter of shoot and root and efficiency of water use and SPAD index of grass pioneer. Water restriction (50% of water restriction) negatively affected the morphogenesis, structural, productive and SPAD unit of grass pioneer. The use doses of up to 40 t ha-1 I cause an increase in TapF 0.0012 sheets folhas.perfilho-1 day-1 and a decrease of 0.0785 days / sheet to phyllochron, increased 0.0160 cm folhas-1 day-1 in water restriction for TalF. For TaseF can observe a reduction of 0.0410 cm leaves-1 day-1 to the dose of 30 t ha-1 for water restriction. For the structural characteristics only for the CFF has seen the effect of compound doses with an increase of 0.3891 cm to fertilization with 30 t ha-1 , the others were influenced only by water restriction. MS production of shoot and root had an increase of 0.5608 and 1.081 g vase-1 in water restriction. The organic compound doses also increased the EUA with an increase of 0.0287 g of MS L-1. The use of organic compound dose up to 30 t ha-1 promoted an improvement of morphological and productive characteristics of grass pioneer in water restriction mainly due to its improved water holding capacity, as well as its response as a source of nutrients for plant.