Parameters of the system for intrasoil application of manure-containing waste water when growing roses

Institute for Engineering and Environmental Problems in Agricultural Production (IEEP) – branch of Federal Scientific Agroengineering Centre VIM (IEEP – branch of FSAC VIM), Saint Petersburg, Russia

^* Corresponding author: vladgordeev@mail.ru

Abstract

One of the ways to utilize manure-containing milking parlor wastewater (MPW) from dairy farms is to use it as liquid fertilizer in greenhouses. Considering that there are no clear recommendations on the disposal of manure-containing milking parlor drains by application in greenhouses, the purpose of the research was to determine the main parameters of the system for subsurface application of manure-containing milking parlor drains - perforation diameter d (mm) and pipeline depth h(mm) when growing roses in the greenhouse. The main factors influencing the process of intrasoil application of manure-containing milking parlor wastewater in a greenhouse have been identified and presented in the form of an information model. A two-factor experiment was planned, the following factors were subject to variation: perforation diameter - from 2 mm to 4 mm, pipeline depth - from 50 mm to 150 mm. The length of each pipeline option is 1500 mm, the internal diameter is 16 mm, the perforation pitch is 100 mm, and a plug is installed at the end. The supply of manurecontaining milking parlor wastewater from the tank to the perforated pipeline was carried out through flexible pipes by gravity at a rate of 6.5 liters per square meter. It has been established that the studied parameters have little effect on the length of rose stems, but have a greater influence on the number of flowers, and the diameter of the perforation of the subsoil pipeline has the greatest influence than its depth. As a result of the research, a mathematical model of the influence of perforation diameter and pipeline depth was obtained, the number of roses q was obtained, and a three-dimensional response surface was constructed. The optimal parameters for introducing manure-containing milking parlor wastewater under these conditions were perforation diameter 2 mm and pipeline depth 111 mm.