Effect of pruning on growth and yield of Taro Kimpul (Xanthosoma sagittifolium) with different harvesting time

This research was conducted in Batusangkar, West Sumatera using a factorial research in the form of randomized block design (RBD). The species of Taro that used as the experimental material was Taro type in the age of 4 months. The purpose of this research is (1) to know the interaction between leaves pruning and difference of harvest times to the growth and production of Taro, (2) to know the best leaves pruning for growth and production of Taro (3) to know the best harvest times in order to get the best Taro production. The treatments of leave pruning in this study consisted of; without pruning, pruning by leaving 4 leaves, and pruning by leaving 6 leaves. On the other hand, the harvest times treatment is on 6 months, 7 months, and 8 months. The results showed that the interaction between leave pruning and harvesting times had an effect on taros’ tuber diameter. On the form of tuber wet weight and length, there were no a significant effect due to the treatment provided, yet the pruning by leaving 6 leaves effected to increase the number of tubers and the productivity of Taro. While the best harvest times to increase productivity of Taro is at the age of 7 and 8 months. Keywords: leave pruning, productivity, harvest times, Xanthosoma sagittifoliu

Genetic Diversity and Association amongst West Sumatra Brown Rice Genotype Based on Morphological and Molecular Markers

The genetic diversity of crops in West Sumatra Province is very high. One of the potentials of plant genetic resources that are well conserved is brown rice. However, the development of new rice varieties has threatened the existence of brown rice. Therefore, conservation efforts are needed to preserve West Sumatra brown-rice-landrace through several stages. The first step is exploration and collection of brown rice genotypes that are still cultivated in West Sumatra Province. The next step is to identify and characterize the brown rice to determine the character of each genotype. The purpose of this study was to explore and characterize brown rice landrace in West Sumatra. The exploration resulted in 31 brown rice genotypes. Variation in quantitative and qualitative traits was observed according to grain morphology. Analysis of relatedness base on morphological grain markers resulted in three groups of brown rice with the degree of similarity of 0.70 and with slight differences in each group. Furthermore, DNA markers categorized the relatedness of brown rice landrace into six groups with 0.70 similarities. Keywords— diversity; brown rice; genotype; morphological; DNA; marker

Genetic Diversity and Association amongst West Sumatra Brown Rice Genotype Based on Morphological and Molecular Markers

The genetic diversity of crops in West Sumatra Province is very high. One of the potentials of plant genetic resources that are well conserved is brown rice. However, the development of new rice varieties has threatened the existence of brown rice. Therefore, conservation efforts are needed to preserve West Sumatra brown-rice-landrace through several stages. The first step is exploration and collection of brown rice genotypes that are still cultivated in West Sumatra Province. The next step is to identify and characterize the brown rice to determine the character of each genotype. The purpose of this study was to explore and characterize brown rice landrace in West Sumatra. The exploration resulted in 31 brown rice genotypes. Variation in quantitative and qualitative traits was observed according to grain morphology. Analysis of relatedness base on morphological grain markers resulted in three groups of brown rice with the degree of similarity of 0.70 and with slight differences in each group. Furthermore, DNA markers categorized the relatedness of brown rice landrace into six groups with 0.70 similarities. Keywords— diversity; brown rice; genotype; morphological; DNA; marker

The Effect of Mulch types with Dose of N, P, and K Fertilizer in Summed Dominan ratio and biomass weed Arabica (Coffea Arabica L.) Coffee in Indonesia

This research was compiled based on Factorial Randomized Group Design (RBD) consisting of 2 factors with 3 groups to obtain 36 experimental units. Each unit consists of 12 plants, 3 plants are taken as samples, so that 432 plants in total with 144 plants as samples. The first fator is the treatment of various types of mulch with 4 levels, namely A1 = no mulch, A2 = mulch rice husk, A3 = mulch banana stem and A4 = black silver plastic mulch. The second factor is the treatment of N, P and K anoragnik fertilizer with 3 levels, namely B1 = 15 g N, 15 g P2O5, 15 g K2O, B2 = 20 g N, 20 g P2O5, 20 g K2O and B3 = 25 g N, 25 g P2O5, 25 g K2O. The results of the study that the treatment of various types of mulch showed the dominant weeds in the cultivation of Arabica coffee in Indonesia was Borreria alata, followed by Elausine indica and Ageratum conyzoides. While the lowest weed biomass was obtained in black silver plastic mulch or N, P and K 15g: 15g: 15g