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Journal : AGROLOGIA : Jurnal Ilmu Budidaya Tanaman

Analisis Peluang Kejadian Deret Hari Kering Selama Musim Tanam Di Kota Ambon Laimeheriwa, Semuel
Agrologia Vol 3, No 2 (2014)
Publisher : Pattimura University, Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/a.v3i2.247

Abstract

Drought is one of natural disaster that is commonly difficult to avoid and become a serious problem in crop production in Indonesia. Therefore, this study was conducted to determine the probability of dry spell during several days and its used to determine  safety growing season in Ambon City. Data analyse was conducted in three steps, that is (1) determination of growing season by FAO (1978); ( 2) analysis of dry spell probability; and (3) determination safety growing season. Result of analysis indicated that the growing season in Ambon City took place during 10 months from December to September next year. During the growing season, the probability occuring of long dry spell  (as much as 10, 15, and 20 days) was relatively smaller, less than 45%. The Probability of the dry spell as much as 10 days was equal to 13% on Juli and up to 42% on September; more than as much as 15 days was equal  to 3% on April and May; and up to 19% on September, and as much as 20 days was  equal to 0% on April and May; and up to 13% on September. High dry spell probability was generally occurred by the end of the growing season in September, whereas the lowest probability of dry spell occured in April and May when almost has no long dry spell.
Analisis Tren Perubahan Curah Hujan dan Pemetaan Klasifikasi Iklim Schmidt - Ferguson untuk Penentuan Kesesuaian Iklim Tanaman Pala (Myristica fragrans) di Pulau Seram Semuel Laimeheriwa; Elia Leonard Madubun; Eklesia D. Rarsina
Agrologia Vol 8, No 2 (2019): Agrologia: Jurnal Ilmu Budidaya Tanaman
Publisher : Faculty of Agriculture, Pattimura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/a.v8i2.1012

Abstract

Perubahan iklim yang terus terjadi hingga saat ini telah memberikan dampak terhadap berbagai segi kehidupan; termasuk sektor pertanian. Penelitian bertujuan untuk menentukan tren perubahan curah hujan, pemetaan klasifikasi iklim Schmidt-Ferguson yang baru, dan menentukan kesesuaian iklim tanaman pala di Pulau Seram.  Penelitian ini menggunakan data curah hujan berbagai lokasi di Pulau Seram selama 60 tahun pengamatan.  Analisis data terdiri dari: (1) analisis pola curah hujan dan membangkitkan data curah hujan menggunakan teknik rataan aljabar, (2) analisis tren perubahan curah hujan, (3) pemetaan klasifikasi iklim, dan (4) penentuan kesesuaian iklim tanaman pala.  Hasil penelitian menunjukkan bahwa di Pulau Seram telah terjadi peningkatan curah hujan rataan tahunan dalam 30 tahun terakhir (periode 1989-2018) dibandingkan dengan priode 30 tahun sebelumnya (periode 1959-1988), yaitu sebesar 11,2 hingga 15,6%.  Di Pulau Seram terdapat tiga tipe iklim Schmidt-Ferguson, yaitu A, B, dan C.  Wilayah yang sangat sesuai untuk pengembangan tanaman pala seluas 1.035 ha atau 59% dari luas Pulau Seram dan daerah yang sesuai seluas 457 ha atau 26% dari luas Pulau Seram.  Sedangkan daerah yang kurang sesuai dan tidak sesuai untuk tanaman pala seluas 258 ha atau 15% dari luas Pulau Seram.Kata kunci:  curah hujan, Schmidt-Ferguson, kesesuaian iklim, tanaman pala, Pulau Seram
Climate Characteristics of Romang Island Semuel Laimeheriwa
Agrologia Vol 9, No 1 (2020): Agrologia: Jurnal Ilmu Budidaya Tanaman
Publisher : Faculty of Agriculture, Pattimura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/a.v9i1.1059

Abstract

Climate is a very dynamic agriculture production factor and varies according to space and time. Therefore, understanding climate characteristics by analysing and interpreting climate data is the needed in agriculture sector. The objective of the research was to present climate characteristics of Romang Island that are used in the agriculture sector. The climate data was obtained from Rainfall Station of Hila, Climate Station of Lakuwahi, and the Meteorology Station of Saumlaki. Rainfall data was analysed using several methods, namely (1) technique of algebra average, (2) Oldeman equation (1977), (3) Schmidt-Ferguson (1951) and Oldeman (1975) climate classification system; and ( 4) Modified Penman method. The result of data analysis indicated that climate of Romang Island is slightly wet characterized by annual average rainfall of 2.628 mm, with 75%  rainfall probability which is equal to 1.794 mm/year. The climate type of Romang Island is B and D1 according to Schmidt-Ferguson and Oldeman classification system, respectively with 11 months of growing season. The highest air temperature is found on November-December and the lowest on months July-August. Humudity is high during the rainy season (December-June) and low during dry season (July-November). While, the sun radiation is longer during dry season and shorter during the rainy season. The annual potential evapotrasnpirasi is 1.771 mm, average wind speed ranges from 1,7 to 4,0 km/hour with the maximum 34 - 58 km/hour.  Annually air temperature in this region has been increased as much as 0,0219ºC, while  rainfall experiences 5% increasing from period of  (1959-1988) to (1989-2018) to the previous period.
Dampak Perubahan Tataguna Lahan Terhadap Keseimbangan Air Wilayah Pulau Seram. Studi Kasus : Das Way Pia Di Kabupaten Maluku Tengah, Provinsi Maluku Semuel Laimeheriwa
Agrologia Vol 1, No 1 (2012): Agrologia: Jurnal Ilmu Budidaya Tanaman
Publisher : Faculty of Agriculture, Pattimura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/a.v1i1.296

Abstract

This research was conducted to estimate the values of parameters which described the physical characteristics of catchments area and monthly water balance components, and understand the sensitivity of the water balance components to change in the parameter value due to the physical changes occurring in Way Pia catchments area, Ceram Island.  The method used involved calculation of the regional water balance in the current time (normal) and during the time of land use change, using an evapoclimatonomy model. The main model inputs were monthly rainfall, global radiation and run off. Analyses of data were conducted with five steps as follows : (1) mathematical formulation of the evapoclimatonomy model, (2) algorithm formation and transfer to computer code, (3) establishment of parameters and calibration, (4) validation of model, and (5) experimentation of model. The current physical conditions of Way Pia catchments area were characterized by: average of parameter value of albedo, a = 0,16; rainfall threshold, Pn = 100 mm; surface run off ratio, np = 0,23; evapority, ep = 0,42; measure of soil water loss from sub surface, vN = 0,12; and measure of evapotranspiration of soil water from sub surface, vE = 0,20. Model output of the current water balance consisted of  annual value of soil moisture, m = 272 mm; total evapotranspiration, E = 1393 mm, and total run off, N = 920 mm. The land use change  in the form of land clearing will increase the parameter values of a and np, which affect on increasing of direct run off (N') of 13% as compared to current conditions.
The Effect Of Climate Change On Productivity Of Clove (Syzigium Aromaticum) In Haruku Island, Central Maluk Regency Imelda Jeanette Lawalata; Herman Rehatta; Semuel Leimaheriwa; Johana Audrey Leatemia
Agrologia Vol 12, No 1 (2023): Agrologia: Jurnal Ilmu Budidaya Tanaman
Publisher : Faculty of Agriculture, Pattimura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ajibt.v12i1.1808

Abstract

The world trade history has recorded Maluku as a spice-producing region, including cloves. This commodity has high economic value and is the main source of income for farmers in several areas in Maluku Province. Climate is an environmental factor that also influences plant metabolism and physiology, so that changes in some elements of climate can have a negative impact on plant growth and productivity. The objective of this study was to get information regarding effect of climate variable on productivity of cclove in Haruku island, Central Maluku Regency. Data was collected by field srvey, while secondary data was gathered form related agencies. The results showed that the Haruku Island area with a local-unimodal rain pattern experienced an increase in annual rainfall of 11.8% in the period of 1991-2020 compared to the previous period (1961-1990). The rainy season rainfall (April-September) tends to increase by 15.2%, while the dry season rainfall (October-March) does not show a significant increase, namely only 1.3%. In the last 60 years (1961 – 2020) in the Haruku Island region, El-Nino extreme dry rainfall occurred 19 times. La-Nina wet extreme rainfall events occurred 14 times. Climate variables that affect production are the average annual length of solar radiation, the average annual relative humidity and the amount of annual rainfall