The Study of nutrient removal and implementation of organic farming on broccoli cultivation to anticipate climate change

Abstract

The excessive use of chemical fertilizers and pesticides continuously has some problems faced by farmers in horticulture cultivation. Implementation of an organic farming system is one way to adaptate climate change for sustainable agriculture, improves soil quality, reducing of the detrimental effect on water quality, and efficient in the use of non-renewable energy. This study aim to determine the level of N, P and K removal, the growth and yield of broccoli on the three kinds of cropping systems in Batur, Getasan-Semarang. The research used a Completely Randomized Block Design with 3 treatments, namely organic, semi-organic, and conventional farming, and replicated 6 times. The soil and plant sampling were used the survey method and broccoli were harvested 8 and 10 weeks after planting. Soil properties analysis was taken before the experiment ongoing, including pH, N-total, C-organic, P-total and P-available, K-total and K-available, CEC, Particle density, Bulk density, and Percentage of total porosity. Plant growth parameters were carried out on 6, 8, and 10 weeks The result of study showed that the chemical and physical properties of the soil in the organic broccoli cultivation better than semi-organic and conventional farming, which proved by soil pH, organic C, total N, P, and K available have a higher value, while the particle density and soil bulk density have a lower value. Moreover, the total porosity and permeability have a higher value compared to conventional farming. Growth and yield of fresh broccoli by the organic farming system are increased about 21.81% and 31.43%, respectively than the conventional farming.