Substrates based on carbonized rice husk combined with phosphate fertilization in coriander and mustard seedlings

Abstract

Combinations of substrates of easy acquisition and nutrients availability favor the production of quality seedlings with lower production cost. Aiming at an alternative for the production of quality seedlings from the insertion of low-cost, sustainable raw material into the commercial substrate, the present work aimed to evaluate the effect of different proportions of the composition of the carbonized rice husk mixture, sand and soil (3:1:3 V:V:V) with commercial substrate (composed of peat fiber and vermiculite), with or without added phosphorus, without development of coriander and mustard seedlings. The experiment was executed in a greenhouse under a randomized block design with six seedlings per plot and seven replications. The treatments were arranged in a 5x2 factorial scheme with 0, 25, 50, 75 and 100 % of the combination added to the commercial substrate with or without addition of triple superphosphate. After 35 days of emergency, plant height, shot dry mass production and roots dry mass production were evaluated. The results showed that there was no effect on the phosphate fertilizer addition to the substrates tested in any evaluated trait, as well as significant interaction between the factors studied in the development of seedlings. The height and dry matter yield of shoots and roots were higher when the combination of carbonized rice husk, sand and soil was added to the commercial substrate in proportions of 50 % and 75 % and 100 % in both vegetables. Carbonized rice husk proved to be an efficient alternative substrate for the production of coriander and mustard seedlings.