immature oil
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2021 ◽  
Vol 8 (03) ◽  
pp. 187-194
Author(s):  
Alhaviz Alhaviz ◽  
Hariyadi Hariyadi ◽  
Supijatno Supijatno

Applying and optimizing an intercropping system between oil palm and seasonal crops such as maize in the immature palm oil plantation is one way of obtaining additional income for farmers until the main crop (oil palm) mature and ready to harvest. The aim of the research was to determine the effects of fertilizers, particularly nitrogen (N) and potassium (K) on the growth and production of maize in an intercropping system with oil palm. The experiment, using one-factor randomized complete block design, was conducted at the Cikabayan Experimental Station, IPB University, Indonesia, from August to December 2020. Four set-ups were prepared corresponding to four different fertilizer applications as follows: A0 (without treatment), A1 (240 g Urea + 80 g KCl + 320 g SP-36 per plot), A2 (480 g Urea + 160 g KCl + 320 g SP-36 per plot), A3 (720 g Urea + 240 g KCl + 320 g SP-36 per plot). Applying the highest dosages of N and K (A3), significantly increased plant height, fresh weight, number of leaves, leaf area, stem diameter, cob length, cob weight, and husk-free cob weight. Intercropping maize with immature oil palm did not affect the oil palm growth.


2021 ◽  
Vol 5 (3) ◽  
pp. 226-232
Author(s):  
Aidil Amar ◽  
Husni Husni* ◽  
Abdullah Abdullah ◽  
Syaukani Syaukani

Hymenopteran parasitoids are biological control agents that contribute mortality to economically important pest of oil palm plantations. In this research we investigated the diversity and abundance of Hymenopteran parasitoids at PT. Mopoli Raya, Aceh Province, Indonesia. Data were collected by adopted a purposive sampling method in mature and immature plantations by using light trap, malaise trap, and yellow-pan trap.  Specimens were identified at Universitas Syiah Kuala and final taxonomic confirmation was conducted at Gadjah Mada University.  We found that the species richness and evenness of the Hymenoptera parasitoid species in mature oil palm plantations tended to be higher than in immature plantations.  It is suspected that in immature oil palm plants (4 years) synthetic pesticide application is more intensive and it has a negative impact on the presence of parasitoids compared to the mature.


2021 ◽  
Vol 12 (1) ◽  
pp. 17
Author(s):  
Endah Dwi Susanti ◽  
Novita Hera ◽  
Syukria Ikhsan Zam

Weed vegetation analysis is important to do in order to know the composition and structure of the vegetation to determine the appropriate weed control measures. This study aims to compare the composition and structure of weeds on peatland immature oil palm plantations and mature palm. This research was conducted from October to December 2020. Vegetation analysis was carried out using a survei method with purposive sampling technique. The parameters observed were density, frequency, dominance, important value index (INP), summed dominance ratio (SDR) and species diversity index (H'). The results showed that the composition of weeds on immature oil palm plantations was found 12 species with number of individual 847, while on mature palm found 9 species with number of individuals 980. The dominant weed structure on immature oil palm plantations is Lempuyangan with SDR values 29,9 % and mature palm is Bandotan with SDR value 23,4%. Weed diversity index on immature oil palm plantations and mature palm is categorized as high with a value of 1.50 for immature oil palm plantations and 1.65 for mature palm.


2021 ◽  
Vol 36 (2) ◽  
pp. 227
Author(s):  
Ayodele Samuel Oluwatobi ◽  
Kehinde Stephen Olorunmaiye

The problem of severe weed infestation often arises during the early phases of establishment of oil palm field due to the spacing requirement and growth habit of young oil palm plantation until later years when the canopy closes. This study was conducted at Ala, Akure-North Local Government Area, Ondo State, Nigeria, to investigate the composition of weed species and their distribution in fruit vegetable-juvenile oil palm intercrop. The fallow alleys within the immature oil palm were intercropped with 2 accessions of tomato (NGB 01665 and NG/AA/SEP/09/053) and eggplant (NGB 01737). The sampling of the weed species was carried out with a quadrat (0.25 m<sup>2</sup>). Weed species parameters and the Diversity Index (D) were quantitatively analyzed. The results revealed that members of <em>Asteraceae </em>and <em>Poaceae </em>gave the highest weed species at 3 and 6 weeks after intercropping (WAI) (17.857% and 19.04%) respectively. A total of 23 and 16 were found at 3 and 6 WAI, while the least diversity index of 0.734 was recorded in the immature oil palm/tomato (NGB 01665) plot at 6 WAI. Farmers should be persuaded to simultaneously intercrop fruit vegetables within the alley of juvenile oil palm, particularly at the earlier years prior to closure of the oil palm canopy.


2021 ◽  
Vol 10 (1) ◽  
pp. 27-36
Author(s):  
Hegar Nurjannah ◽  
Lucy Robiartini ◽  
Susilawati Susilawati

Oil palm (Elaeis guineensis Jacq.) belong to the Arecaceae family, is economically valuable for oil production. The objective of this study was to evaluate the growth of immature oil palm intercropped with red chili pepper and to evaluate the best spacing for red chilli cultivation between immature oil palm. The study was conducted in Rimba Jaya Village, Air Kumbang District, Banyuasin Regency, South Sumatra. The study began in October 2017 until February 2018. The design used for the red chili pepper cultivation was a one-factor Randomized Block Design.  Spacing used as treatments, namely: (M1 = 50  x 50 cm ; M2 = 60  x 60 cm ; M3 = 70  x 70 cm). Treatments were placed in 5 groups. The results showed that plant height, stem diameter, canopy diameter and the greenness level of palm oil leaves did not affect by the presence of red chili pepper. While spacing of 50  x 50 cm provided a positive response to the growth and yield of chili pepper.  The highest yield of red chili was 10.41 kg produced in 50  x 50 cm spacing.


2021 ◽  
Vol 10 (1) ◽  
pp. 104-112
Author(s):  
Eliartati Eliartati ◽  
R S Anggraini ◽  
A Sofia

The application of organic matter is a way to improve upland rice productivity that grows among immature oil palm plants. To improve the yield of upland rice among immature oil palm plants, this study has been carried out by providing organic matter. The research aimed to determine the effect of organic matter application for upland rice production that plant among immature oil palm. The experimental design used in this study was Randomized Block Design with 5 treatments and 4 replications. The treatment includes: control, rice straw compost, weed biomass compost, palm oil empty bunch compost, and cow manure. The dose of organic matter given was 3 tons/ha. The results showed that the application of organic materials have significant effects on yield component and the production of upland rice. In general, the best yield and yield components were obtained in the manure treatment, namely plant height 104.7 cm; the number of productive tillers 158 grains; the percentage of filled grain per panicle was 85.8% and grain yield was 5.6 tons/ha or increase by 21.74% compared to the control treatment (4.6 tons/ha). The highest number of productive tillers and weight of 1000 grains were obtained in the palm oil empty bunch compost treatment (14.5 and 28.2 g).


2021 ◽  
pp. 014459872098303
Author(s):  
Sibo Wang ◽  
Zhiguang Song ◽  
Jia Xia ◽  
Yuan Gao ◽  
YaoPing Wang ◽  
...  

In this study, the methane adsorption capacity of kerogen isolated from the Cambrian, Silurian, and Permian shales and the impact of soluble organic matter (SOM) on the adsorption capacity of these shales were investigated. The results reveal that 1) the adsorption capacity of kerogen varies in a broad range, from 14.48 to 23.22 cm3/g for the Cambrian kerogens, from 15.50 to 36.06 cm3/g for the Silurian kerogens, and from 10.71 to 11.15 cm3/g for the Permian kerogens; 2) the kerogen adsorption accounts for 33.67–70.23% of the total adsorption capacity of these Palaeozoic extracted shales, demonstrating that kerogen is the primary adsorbing substance in shales; 3) the adsorption isotherms of kerogen in highly mature Cambrian and Silurian shales are similar to those of Triassic coal, while the isotherms of kerogen in the relatively immature Permian shales are similar to those of the immature oil shales; and 4) the SOM demonstrates a significant impact on the adsorption capacity of shales as the removal of SOM can cause a maximum increase of 34.29% or a decrease of 23.36% in the total adsorption capacity of shales. However, there is no clear understanding of the impact of SOM on the methane sorption of shales.


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