SIRISMA

Background: In Indonesia, cassava is the staple food after rice and maize. One way to increase the productivity of cassava is the use of fertilizers. Fertilization is an act of providing additional nutrients to the soil, either directly or indirectly, so that it can provide nutrients for plants. Fertilization is an important thing given to plants so that plants can grow and develop properly. Plant growth and development are strongly influenced by the availability of nutrients in the soil.

Materials and Methods: This research was conducted at the Experimental Garden of the Faculty of Agriculture, Slamet Riyadi University, Surakarta, which is located in Banjarsari Village, Banjarsari District, Surakarta. The research design used a completely randomized design (CRD) which consisted of a single factor, including various kinds of organic fertilizers with three levels of doses. Treatment with 3 repetitions, the treatment was the type and dose of organic fertilizer (MD) with 9 levels and the treatment without fertilizer as a control. Each treatment was repeated 3 times so that in total there were 30 research treatment units. The data analysis used was the ANOVA (Analysis of Variance) test. If there is a difference, it is continued with the Honest Real Difference Test (BNJ) at the 5% level to determine the influential and non-influential treatments.

Results: The results showed that the treatment of types and dosages of organic fertilizers significantly affected the growth and yield of cassava per plant. The most significant effect was observed in the parameters of shoot height, number of leaves, shoot dry weight, number of tubers, and tuber weight per plant. Treatment MD7 = vermicompost fertilizer dose of 720 g / polybag gave the highest yield on shoot dry weight of 378 grams, but the highest yield of tubers and tuber weight was achieved in the treatment of vermicompost fertilizer with a dose of 1.2 kg/polybag, which was 7.33 tubers weighing 2, 87 kg of cassava per plant.

Conclusion: The kinds and dosage of organic fertilizers affected the growth of cassava and a significant effect was shown in the use of vermicompost fertilizer.

Key Word:  Kinds of Fertilizer, Dosage, Growth, Yield, Cassava.