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Abstrak :
ABSTRAK
Pengaruh eksudat akar dan ekstrak daun Helianlhus mmuus serta Ipomoea batala' terhadap pertumbuhan rumput gajah Petmiselum po/ystacltyon telah dilakulrnn; diamati pula pertumbuhannya bila ditanam di dalam 1 pot bersama H. annuus atau l batatas.

Pada penelitian ini. eksudat akar H. mvruus mampu menurunkan persentase perkecambahan biji dan panjang kecambah rumput gajah sampai 23,87 dan 47 % terhadap kontrol dalam 90 jam; sementara eksudat akar I. halalas menunjukkan penurunan 22,37% dan 23,83 %.

Eksudat akar dari tanaman bunga matahari yang disiramkan selama 5 minggu pada rumput gajah umur 10 hari menekan tinggi gulma itu 13,62%; berat segar dan berat kerlng 39,56 dan 51,24 %. Eksudat akar tanarnan ubi jalar hanya berpengaruh menekan berat segardan berat kerlng gulma itu sampai 18,58 dan 18,40%.

Ekstrak daun H. anmms sertal. hatatas 4 % b.k. mampu mengbambat persentase perl:ecambahan dan tinggi kecambah rumput gajah dalam 90 jam berturut-turut sebesar 38,45 dan 15,28% serta 30,79 dan 19,45%.

Ekstrak daun H. annuus sertal. halalas 2% b.k.yang disiramkan sekali seminggu Rumput gajah yang ditanam dalam 1 pot bersama H. annuus atau l halatas tidak menunjukkan perbedaan nyata dalam tinggi dan berat segar rumput gajah; namun berat kering menunjukkan penurunan 33,44 dan 39,63% terhadap kontrol.

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ABSTRACT
Pennisetum polystachyon is native of Tropical Africa. It has a high reproductive capacity and rapid seed germinationit becomes a troublesome weed when it takes over waste- and cultivated lands. It is now also found along the road sides and highways in Indonesia. The seeds are wind dispersed and have a resilient ability to survive drought and certain cultural and chemical control methods. The concept that some crop plants may be allelopathic to certain weeds is receiving increased attention in the search for alternative weed control strategies. Helianthus ammus and Ipomoea aquatica are amongst the crop plants that may have the allelopathic effect to some weeds.

This research aims to study the inhibiting potential of H. mmuus and I. batatas on the growth of P. polystachyon. This study observed the effects of root exudates and leaf extrects of H. annuus and /. batatas on the germination and growth of P. polystachyon; and also on the growth of this weed grown together with H. a1muus or I. batatas.

Root exudates taken from the sand planted with H. mmuus or I. halalaS for 4 Root exudates liquid comes out from watering H. ammus or/. batatas (01, 2, 3 and 4 plants/pot), poured over a 10-days seedling of P. polyslachyon twice a day during 5 weeks (5 replications each) reduced the height, fresh and dry weight of the weed. The height reduced up to 13.62 %; fresh and dry weight up to 39.56% and 51.24% by the root exudate of H. annuus; while those of L batatas had no effect to the height of P. polystachyon hut did reduce the fresh and dry weight up to18.58 and 18.40%.

Leaf extracts of H. anmms or I. halalas (0--4 % dry weight), with 5 replications each, reduced also the percentage of germination and length of the germination of seed ofP. polystachyon. During 90 hours, leaf extracts of H. ammus reduced the percentage of gennination of the weed species up to 38.45 % and length of the germination of seeds up to 15.28 %; while those of L halalas up to 30.79% and 19.45% respectively.

The I0 days-old seedling of P. polystachyon with SO mlleaf extracts of H. anmtus or L halalas (0; 0.5; J.O; 1.5; and 2% dry weight) once a week, showed a little difference effect on those weed growth a week after the third treatment. Leaf extract of H. anmms almost had no effect on the weed growth both in height, fresh and dry H. annuus- P. polystachyon and /. batatas- P.polystachyon grown together in a pot (0-5; 1-4; 2-3; 3-2; 4-1; and 5-0) for 5 weeks; 4 replications each, gave another result; both had no effect on height and fresh weight of P. polystachyon. H. annuus­ P. po/ystachyon and I. halalas- P. polystachyon 4-1 reduced the dry weight significantly up to 33.44 and 39.63 %.

Abstrak :
Peninjauan aktivitas budidaya rumput laut secara optimal perlu dilakukan mengingat tingginya daya dukung lingkungan dan bernilai ekonomis. Namun perkembangan pariwisata membuat aktivitas budidaya rumput laut terus terdesak. Penelitian ini bertujuan untuk menganalisis kesesuaian wilayah budidaya rumput laut berdasarkan kondisi perairan dan aktivitas budidaya rumput laut di Pulau Serangan beserta hubungannya. Variabel yang digunakan ialah kondisi perairan, pengelola, teknologi, manajemen, dan objek wisata. Kesesuaian wilayah budidaya rumput laut di Pulau Serangan diperoleh melalui pengolahan data citra Landsat 8 tahun 2020 serta pengukuran lapang in situ maupun ex situ. Survey dan wawancara dilakukan untuk menganalisis aktivitas budidaya rumput laut di Pulau Serangan. Metode skoring dan overlay digunakan pada seluruh variabel yang kemudian dianalisis spasial. Analisis statistik deskriptif juga dilakukan untuk menganalisis hubungan antara kesesuaian wilayah berdasarkan kondisi perairan terhadap jumlah produksi rumput laut. Hasil analisis menunjukkan bahwa wilayah yang sesuai untuk budidaya rumput laut terletak di segmen Teluk Lebangan. Aktivitas budidaya rumput laut tinggi terletak di segmen Teluk Lebangan, aktivitas budidaya sedang terletak di segmen Pantai Timur Serangan, dan aktivitas budidaya rendah terletak di segmen Teluk Serangan. Kesesuaian wilayah budidaya rumput laut berdasarkan kondisi perairan berupa suhu, salinitas, arus, muatan padatan tersuspensi, dan oksigen terlarut secara simultan berpengaruh terhadap jumlah produksi rumput laut di Pulau Serangan. Semakin tinggi oksigen terlarut, suhu, dan kecepatan arus maka jumlah produksi rumput laut di Pulau Serangan akan meningkat. Semakin rendah muatan padatan tersuspensi dan salinitas maka jumlah produksi rumput laut di Pulau Serangan akan meningkat. ......Seaweed cultivation is an alternative use of coastal areas. An optimal review of seaweed cultivation activities needs to be done, considering the environment's high carrying capacity and its economic value. However, the development of tourism has made seaweed cultivation activities continue to be pressed. This study aims to analyze seaweed cultivation areas suitability based on water conditions and seaweed cultivation activities on Serangan Island and their relationship. The variables used are water conditions, cultivation, technology, management, and tourist objects. The suitability of the seaweed cultivation area on Serangan Island was obtained through Landsat 8 imagery data processing in 2020 and field measurements in situ and ex-situ. Surveys and interviews were also conducted to analyze seaweed farming activities on Serangan Island. The scoring and overlay methods were used for all variables, which were then analyzed spatially. Descriptive statistical analysis was also carried out to analyze the relationship between the suitability of the area based on water conditions and seaweed production. The analysis results show that a suitable area for seaweed cultivation is in the Lebangan Bay segment. The high level of seaweed cultivation activity is in the Lebangan Bay segment, moderate cultivation activity is in the Serangan East Coast segment, and low cultivation activities are in the Serangan Bay segment. The suitability of the seaweed cultivation area based on water conditions in temperature, salinity, current, total suspended solids, and dissolved oxygen has a simultaneous effect on seaweed cultivation activities on Serangan Island. The higher the dissolved oxygen, temperature, and current speed, the amount of seaweed production on Serangan Island will increase. The lower total suspended solids and salinity, the amount of seaweed production on Serangan Island will increase.