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Journal of Tropical Crop Science
ISSN : 23560169     EISSN : 23560177     DOI : -
Core Subject : Agriculture,
Journal of Tropical Crop Science is an international journal publishing research related to tropical crops. Articles in the journal focus on in-vivo and in-vitro production and production environment, breeding, seed technology, physiology, postharvest, pest and pathology of cereals, vegetables, fruits, ornamentals, medicinal and plantation crops; soil, landscape, turf and agro ecology management under tropical conditions.
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Articles 4 Documents
Search results for , issue " Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018" : 4 Documents clear
Increasing Production of Chilli (Capsicum annuum L.) through Foliar Fertilizer Application Sugiyanta, Sugiyanta; Kartika, Juang Gema
Journal of Tropical Crop Science Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Chili is one of the most important spices in Indonesia; the demand for chili is increasing along with the growth of the population. Chilli is generally grown under intensive culture which includes addition of fertilizers to improve crop growth and increase crop productivity.  A study was conducted to examine seven different rates of an inorganic foliar fertilizer HF at 0.5, 0.75, 1, 1.25 and 1.5 of the recommended rate, with no foliar fertilizer and a standard foliar fertilizer GD as control. The results showed that spraying foliar fertilizer HF generally improved the growth and yield of chilli compared to without fertilizer. Plant height, number of branches and number of fruits per plant, weight per fruit, weight per 10 fruits, yield per plant, yield per plot, and yield per ha of chilli treated with inorganic fertilizers was significantly higher than the without foliar fertilizer. Foliar fertilizer HF at 0.5 of the recommendation rate, or 1 kg.ha-1 foliar fertilizer applied at 4, 6, 8, 10, and 12 week after planting in addition to the basic fertilizers of 400 kg.ha-1 of urea, 200 kg.ha-1 of SP-36, 250 kg.ha-1 of KCl applied to the soil, was effective to obtain the maximum chilli fruit yield.
Reduction of Urea Fertilizer Uses through Application of Livestock Manures in An Integrated Farming of Maize and Cattle Suwarto, Suwarto
Journal of Tropical Crop Science Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Crops and livestock have historically been grown together in an integrated farming; this system facilitates sharing of nutrient and land resources, and benefiting both operations. The current study examined integrated farming of maize and cattle in Waleran Village, East Java, Indonesia. In maize cultivation, the farmers apply 10 ton of the manure, 300 kg Urea (46% N) and 300 kg NPK Phoska (N:P2O5:K2O = 15%:15%:15%) per hectare. However, more nitrogen had actually been applied when manure is added, increasing the amount of nitrogen by 180 kg N.ha-1 which consequently a waste.  Therefore, more efficient application of nitrogen in maize production needs to be studied.  A field experiment was conducted from November 2017 to March 2018 using maize “Pioneer 32”. The study was organised in a completely randomized block design consists of 10 m x 10 m plots and four replications. The crops were fertilized with nitrogen at 46, 91, 137 and 183 kg.ha-1. Two seeds of maize were planted per hole with planting distance of 70 cm between rows and 40 cm within row. Plant growth were measured weekly at four to eight weeks after planting; yield variables were measured at harvest. The increasing nitrogen levels did not significantly influence the maize growth or yield.  The manure contributed about 114 kg.ha-1nitrogen supply.  The lowest total nitrogen fertilizer applied (159 kg.N ha-1) resulted in the optimum leaf area index (4.65) and leaf nutrient content of N (2.70%) and P (0.26%) which is above to the critical leaf nutrient content with maize grain yield of 6.19 ton ha-1. The manure in integrated farming could reduce the use of Urea due nitrogen contribution from the livestock manures.               Keywords:  maize growth, nitrogen levels, leaf area index, leaf nutrient content 
Cocoa Production Stability in Relation to Changing Rainfall and Temperature in East Java, Indonesia Santosa, Edi; Sakti, Ginanjar Pramudya; Fattah, Muhamad Zainul; Zaman, Sofyan; Wahjar, Ade
Journal of Tropical Crop Science Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Climate change as indicated by rising temperature and changing rainfall pattern has been known to affect cacao production in many production countries. However, studies on the effects of rainfall and temperature variability on the cacao production are rarely reported in Indonesia. Hence, the objective of this study is to evaluate the stability of cocoa production in relation to rainfall and temperature variability in order to develop sustainable production under climate change scenario. Research was conducted at a state owned company in Jember District, East Java, Indonesia from February to June 2015. Production and climatic data of 2010-2015 were evaluated using simple regression and correlation analysis. Results revealed that productivity fluctuated among months and among years. However, the fluctuation among months (s2 = 117.076) was lower than among years (s2 = 311.225). Rainfall and temperature showed variability among months and among years; and the fluctuation among months was lower in both rainfall and temperature. Rainfall at one to four months before harvest correlated with production (r=0.400-0.671; P= 0.000 to 0.001) and temperature at two to four months before harvest determined cocoa production (r=0.371-0.412; P=0.001-0.003). High monthly cocoa production coincided with decreasing temperature and rainfall for 4 to 5 months during pod development. The presented study implies that both short and long term strategies should be implemented under climatic variability to sustain cocoa production. It is recommended to apply production technology to stabilize micro climate temperature and to minimize the impact of high rainfall such as shade plant and canopy manipulation.
Correlations between Leaf Nitrogen, Phosphorus and Potassium and Leaf Chlorophyll, Anthocyanins and Carotenoids Content at Vegetative and Generative Stage of Bitter Leaf (Vernonia amygealina Del.) Tjhia, Betty; Aziz, Sandra Arifin; Suketi, Ketty
Journal of Tropical Crop Science Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Vernonia amygdalina Del. (Asteraceae) is a nutritional and medicinal plant that is used widely throughout tropical Africa and other countries. The leaves are proved to have strong antioxidant property. The concentration of chlorophyll a, chlorophyll b, anthocyanins and carotenoids in five different leaf positions of vegetative and generative phases were studied. The aim of the study is to understand and to correlate the content of the three nutrients and the bioactive compounds along the five leaf positions at vegetative and generative stage of the crop growth. The study showed that the concentration of chlorophyll a and b was higher, and anthocyanin concentration was almost zero in the generative than in the vegetative stage. The leaf concentration of N, P, and K were higher in vegetative than in generative stage. At vegetative stage, N positively correlated with chlorophyll a at the 1st leaf; K had strong correlations with anthocyanins at the 2nd and 3rd leaf and with chlorophyll a at the 2nd and 5th, and with chlorophyll b and carotenoids at the 5th leaf. At the generative stage, P had a strong positive correlation with carotenoids at 4th and 5th leaves, and K positively correlated with chlorophyll a and b at 5th leaf. The findings suggest that bitter leaf is better to be harvested at vegetative stage, and that potassium level is important to increase ­anthocyanins and carotenoids content.

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