Toleransi Klon Unggul Jarak Pagar Terhadap Cekaman Kelembapan Tanah

ABSTRAK

Klon-klon unggul jarak pagar yang akan dilepas menjadi varietas unggul untuk lahan kering seharusnya diketahui tingkat toleransinya terhadap cekaman kekurangan air. Penelitian bertujuan untuk mengetahui tingkat toleransi klonklon unggul jarak pagar dilakukan di Rumah Kaca Balai Penelitian Tanaman Pemanis dan Serat, Malang, Jawa Timur pada JuliNovember 2015. Perlakuan disusun dalam rancangan petak terbagi dengan tiga ulangan. Petak utama berupa empat taraf kelembapan tanah (40, 60, 80, dan 100% dari kapasitas lapang) dan anak petak berupa lima klon unggul (HS-49/NTT, PT-7/Lampung, HS-49 x SP-88, SP-88 x IP-1A, dan PT-7 x SP-117) dan satu klon pembanding (IP3A). Hasil penelitian menunjukkan bahwa klon PT-7 x SP-117 tergolong klon moderat, klon IP-3A tergolong sangat rentan dan klon-klon SP-88 x IP-1A, HS-49 x SP-88, PT-7/Lampung, dan HS-49/NTT tergolong rentan terhadap cekaman kelembapan tanah.

Kata kunci: cekaman, jarak pagar, kelembapan tanah, klon

ABSTRACT

Jatropha superior clones which will be released as varieties suitable for dryland should have been tested for their level of tolerance to stress of water. The study aimed to determine the level of tolerance of physic nut superior clones. Greenhouse research was carried out in The Research Institute of Sweeteners and Fiber Crops, Malang, East Java in JulyNovember 2015. The treatments were arranged in the split-plot design with three replications. The main plot consists of four levels of soil moisture (40, 60, 80, and 100% of field capacity) and the subplot consists of five clones (HS-49/NTT, PT-7/Lampung, HS-49 x SP-88, SP -88 x IP-1A, and PT-7 x SP-117) and one control clone (IP-3A). The results showed that PT-7 x SP-117 classified as a moderate clone, IP-3A was a very resistant clone and SP-88 x IP1A, HS-49 x SP-88, PT-7/ Lampung, and HS-49/NTT were resistant clones to soil moisture stress.

Keywords: clones, jatropha, soil moisture, stress

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