A research was conducted to study the effect of nitrogen and potassium (NK) fertilizers and plant density on the growth and yield of taro (Colocasia esculenta (L.) Schott var. Antiquorum). The field experiment was carried out at Brawijaya University experimental field station located at Jatikerto, Malang, Indonesia. The experimental treatments consist of three plant density (18,000, 24,000 and 30,000 haG
Air pollution may be indicated by the higher acid rain. Air pollution caused by the burning of fossil fuels increase emissions of SOx ,NOx , and CO 2 which can ultimately lead to acid rain. Exposure of acid rain may affect the cultivation of mulberry and the quality of silkworm cocoon. The aim of this research was to determine the effect of mulberry plants that have been exposed to acid rain to the percentage of cocoon defects and type of defects in C-301 and BS-09 races of Bombyxmori L. Acid rain that to applied on mulberry plant for 5 weeks was a modification of acid rain that occurred in Sidoarjo East Java, Indonesia. A total of 720 individuals of newly hatched silkworm were used in early research. Larvae fed by mulberry leaves that had been treated with artificial rain water in different levels of pH, i.e. pH's of 7.0 (well water as control), 6.2 (normal rain), and 4.6 (acid rain). Cocoon defects and type of cocoon defect were observed. Data were analyzed using multivariate ANOVA. The results showed that the treatments had no significant effect (P >0.05) on defective cocoon percentage. Treatment of pH 7.0, 6.2, 4.6 had defective cocoons of 21.34%, 12.94%, 11.2%, respectively in race C-301 and 18.49%, 15%, 15.26%, respectively in race BS-09. Meanwhile, cocoon defect types in race C-301 and BS-09 were outer defects consisting of printed, outside stained, malformed, very small, double cocoons, and inner defect consist of thin-end and inside stained cocoons. As a whole, acid rain treatments to defective cocoon of Bombyx mori L. in C-301 and BS-09 races showed no significant effect to defective cocoons.
In 2015, the clove plants on Ternate Island experienced a drought and dead in the dry season. This study aimed to discover the potential for rainwater and soil moisture as well as the management to meet the water needs of clove plants. This research was conducted from October 2018 to March 2019 on Ternate Islan. The soil data (pF 2.4 and 4.2) and effective depth at 12 land units. The climate data for 2008 to 2017. The data analysis used the water balance approach of the Thornthwaite-Mather method, the Penman-Monteith method, Darcy's law of the SPAW model, and the CropWat 8.0 software. The results showed that the total rainfall was 2307.3 mm/year. The average soil moisture storage (STo) was 134.5 mm. During the dry season, the total rainfall was 1660.4 mm/year. The potential evapotranspiration was 1561.2 mm/year. The water needs for the clove plantation in the tree phase during the dry season was 640.1 mm/year or 53.3 mm/month and increased from the water needs for clove plants in normal conditions which was 607.1 mm/month. The strategies for managing the water needs for the clove plants during dry season were harvesting rainwater during surplus in December and January for storage and increasing soil moisture during water deficit in February and March, using the biopore infiltration hole technology made from organic material from clove leaf litter. Further research on the water needs for clove plants in the vegetative phase.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.