Judul: The Treatment of Leaf-Fruit Ratio and Foliar Fertilizer on the Quality of Abiu Fruit (Pouteria caimito Radlk.)
Abstrak: Abiu (Pouteria caimito Radlk.) is a plant belong to the Sapotaceae family that can be consumed fresh, processed and as herbal products. Abiu has 72 types of bioactive compounds found in its fruit with an area percentage of >1%. The purpose of this research aimed to (1) determine the effect of the treatment of leaf-fruit ratio on the quality of abiu fruit, (2) determine the effect of leaf fertilizer on the quality of abiu fruit, and (3) determine the interaction of the treatment of leaf-fruit ratio with the concentration of leaf fertilizer on quality of abiu fruit. The research was conducted at Balungbang Jaya, Bogor city, West Java Province, from July 2022 to November 2022. This research used a split plot factorial Randomized Complete Block Design (RCBD) that consisted of 3 replications, the main plot was leaf-fruit ratio, namely 45 leaves : 1 fruit and 30 leaves : 1 fruit which was carried out on tertiary branches of plants, and sub plot is the concentration of foliar fertilizer which consistsed of 1, 2, and 3 g L-1. The fertilizer applied to each treatment was dissolved in a concentration of grams per liter of water. The number of plants in the research was 18 trees. The research results showed that the leaf-fruit ratio and foliar fertilizer improved the quality of abiu fruit, which was indicated by a trend of increasing fruit quality, although it did not show a significant difference. The difference between Leaf-fruit ratio 45:1 versus 30:1 and foliar fertilizer increased the horizontal and vertical diameter of fruit at 4 – 9 weeks after anthesis and the weight of abiu fruit with a percentage range below 10%. Total Dissolved Solids (TDS) is 12.22% and the Total Dissolved Solids/Total Titratable Acidity (TDS/TTA) ratio is 6.42% if the ratio is 45:1 compared to the ratio 30:1. Application of foliar fertilizer increased fruit weight by 10.74%, TDS by 10.94%, and TDS/TTA ratio by 18.42%. The interaction between leaf-fruit ratio and foliar fertilizer had a significant effect on TTA, but had no significant effect on the internal and external quality of abiu fruit.
Keyword: Leaf fruit ratio, Abiu, Pupuk daun, Bioactive compounds, Sapotaceae, tertiary branch, total titratable acidity

Judul: Optimizing Active Compund of Pesticides and Spraying Intervals to Increase the Quality of Abiu Fruit (Pouteria caimito Radlk.).
Abstrak: Abiu merupakan buah tropika yang berasal dari Amazon. Abiu berpotensi untuk dikembangkan di Indonesia karena kaya nutrisi dan manfaat. Kecacatan kulit buah abiu menjadi masalah yang umum dijumpai. Penelitian ini bertujuan mempelajari pengaruh pengaplikasian beberapa jenis bahan aktif pestisida dan interval penyemprotan serta interaksiknya terhadap kualitas buah abiu. Penelitian dilakukan di kebun buah abiu dan Laboratorium Pascapanen Departemen Agronomi dan Hortikultura, Fakultas Pertanian IPB. Rancangan yang digunakan adalah rancangan kelompok lengkap teracak dua faktor dengan tiga ulangan. Faktor pertama adalah jenis bahan aktif pestisida, yaitu mankozeb+streptomisin sulfat (P1), benomil (P2), dimetoat (P3), klorpirifos (P4), dan kontrol (P5). Faktor kedua adalah interval penyemprotan, yaitu 1x2 minggu (V1), 1x1 minggu (V2), dan 2x1 minggu (V3). Perlakuan jenis bahan aktif pestisida berpengaruh nyata terhadap kemulusan buah abiu. Bahan aktif benomil tidak memberikan pengaruh berbeda nyata dengan bahan aktif dimetoat dan klorpirifos. Benomil mempertahankan kemulusan sebesar 73,88%, dimetoat 71,33%, dan klorpirifos 65,77%. Interval penyemprotan dan interaksi keduanya tidak berbeda nyata terhadap kemulusan buah. Kedua perlakuan tidak berpengaruh nyata terhadap perkembangan buah, kelunakan, bobot, volume, PTT, TAT, dan vitamin C., Abiu is a tropical fruit from Amazon. It has potential to be developed in Indonesia. Imperfections that found in abiu’s skin are commonly problem. This study aims to determine the effect of several active compund pesticides, spraying intervals, and their interaction on the quality of abiu fruit. The research was conducted at abiu field and The Postharvest Laboratory of Agronomy and Horticulture Department, Faculty of Agriculture IPB. The experimental design used was a factorial completely randomized block design with three replications. The first factor is the active compound of pesticides, namely mancozeb+streptomycin sulfate (P1), benomyl (P2), dimethoate (P3), chlorpyrifos (P4), and control (P5). The second factor is spraying intervals, namely 1x2 week (V1), 1x1 week (V2), and 2x1 weeks (V3). The active compound of pesticides did significantly affect the fruit smoothness. Benomyl didn’t give significantly affect than dimethoat and chlorpyrifos. Benomyl gave 73,88% in maintaining the smoothness abiu fruit, dimethoat at 71,33%, and chlorpyrifos at 65,77%. The spraying interval and its interaction with the active coumpund treatments didn’t significantly affect the fruit smoothness.Both treatments had no significant effect on fruit development, firmness, weight, volume, TSS, TAT, and vitamin C variables.
Keyword: Abiu, Active compound of pesticides, Fruit quality, Spraying intervals

Judul: Karakteristik Barisan Eksak Pendek HomR(N, ) dan HomR( ,N)
Abstrak: Module merupakan generaIisasi dari ruang ve}ctor, dimana pada ruang vektor skalar-skalamya berasal dati suatu lapangan (field) sedangkan pada module skaJar-skalamya merupalam unsur-unsur dan suatu ring R dengan unsur satuan. Dari suatu grup komutatif yang unsur-unsumya dipadukan dengan unsur-unsur dart suatu ring R, maka akan mengbastlk.an yang namanya R-module. Himpunan seroua fungsi homomorfisma yang memetakan dati R-module M ke R-module N dinotasikan sebagai HomiM,N), dimana HomiM,N) juga merupakan suatu R-module.
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