Desenvolvimento inicial de melancieira, sob estresse salino do solo e aplicações de bioestimulante.

Abstract

The effect of salinity on plant growth and development is one of the biggest problems discussed by researchers, especially in arid and semi-arid regions, since the evapotranspiration rate is higher than rainfall, thus causing a decrease in agricultural production. and even the death of plants, when grown in saline soils. The use of biostimulant has been used as a new technology that provides the attenuation of salt stress in plants, as well as a greater increase in plant production, as it acts in the expression of genetic potential, in hormonal balance, accelerates seed germination and contributes in the development of the root system, accelerating the natural cycle. However, in Brazil there are still few products registered with this function. The objective of this research was to evaluate the tolerance and the initial development of the watermelon, submitted to biostimulant applications under the saline stress of the soil. Five treatments were tested: Soil salinity of 0.6 dS m-1 Without Viusid-Agro Biostimulant (SS0.6 + SB); Soil salinity of 0.6 dS m-1 and Viusid-Agro Biostimulant (SS0.6 + BVA); 1.6 dS m-1 soil salinity and Viusid-Agro biostimulant (SS1.6 + BVA); Soil salinity of 2.6 dS m-1) and Viusid-Agro Biostimulant (SS2.6 + BVA) and Soil salinity of 3.6 dS m-1 and Viusid-Agro Biostimulant (SS3.6 + BVA), with 4 repetitions. The application of biostimulant in plants subjected to salinity of 3.6 dSm-1 favored, mainly the number of leaves, fresh stem mass, dry stem mass, total fresh mass, percentage of dry mass, partition of dry leaf mass and dry stem mass partition. The SS2,6 + BVA treatment increases the leaf number, root volume, stem dry mass, root dry mass and total fresh mass of the watermelon plants, while the SS0,6 + BVA treatment increases the number of leaves, total fresh weight, leaf dry weight, root dry weight and total dry weight. The presence of the biostimulant in plants subjected to salinity of 1.6 dS m-1 favored the variables: plant length, number of leaves, dry stem weight and total fresh weight.