Sugarcane is one of the main sugar-producing commodities in Indonesia. The one of the efforts to increase the production and yield of sugarcane can be done by fertilization using organic fertilizer and the use of improved varieties. The aim of this research are to get optimal rate of solid organic fertilizer, the best sugarcane variety, and interaction between solid organic fertilizer rate and variety on productivity of sugarcane. The study was conducted in December 2015 until December 2016 at Teaching Farm and Chemical Analysis Laboratory, State P olytechnic of Lampung. The research used Factorial Random Block Design method, with two factors. The first factor is the rate of solid organic fertilizer (Control, 1.000 kg.ha-1 , 1.500 kg.ha-1 , and 2.000 kg.ha-1), whereas the second factor is sugarcane varieties (GMP 3, GMP 19, and SS 57). The data of the research were analyzed by analysis of variance and if the result was significantly different then continued by using LSD test of 5% level. The results showed that there was interaction between the use of solid organic fertilizer 1000 kg.ha-1 and GMP 3 varieties on variable length of sugarcane stem. The productivity of sugarcane crops can be improved by the application of 1000 kg.ha-1 solid organic fertilizer which influences the variables of sugarcane quantity per lube and the number of sugarcane segments. The best variety that can be used to increase the productivity of sugarcane is GMP 3.
Fruit-sucking bugs (Helopeltis spp.) are one of the main pests on cocoa plants. The damage caused by this pest is by piercing and sucking the liquid of cocoa pods and young shoots. This study aimed to obtain the effective concentration of papaya leaf extract and yam extract on the mortality of cocoa fruit-sucking bugs. This research was carried out at the Plant Production Laboratory II of the Politeknik Negeri Lampung from September 2020 to January 2021. The design used in this study was a Randomized Block Design consisting of 4 treatments and six replications. The results showed that the average daily mortality rate fluctuated in each treatment. In all treatment concentrations of papaya leaf extract and yam extract, the average mortality of cocoa fruit-sucking bugs ranged from 25.76% to 75.76%. All treatment concentrations of papaya leaf extract and yam extract were not effective in the mortality of cocoa fruit-sucking bugs.
Armyworm (Spodoptera litura F.) is one of the important polyphag leaf pests that attacks almost all crops. The objective of this study was to determine the effect of various concentrations of bioinsecticide made of dioscorea tuber and aegle fruit extract on larval mortality. The research was conducted at the crop laboratory, Lampung State Polytechnic since October 2017 until December 2017. The experimental design is a completely randomized design with six treatments and four and replications. The parameters observed is mortality of armyworm larvae, which would then be analyzed using fingerprint of different varieties. That result showed that dioscorea tuber and aegle fruit extract has affected on larval mortality armyworm. Pure (100%) dioscorin tuber extract exhibited the highest larval mortality.
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