Penelitian tentang penggunaan TSP dan Pupuk P Cair (PPC) telah dilakukan di kebun Cidangdeur, Pabrik Gula (PG) Subang. Penelitian bertujuan untuk mengkaji pengaruh PPC dan TSP terhadap hasil gula dan sekaligus menetapkan takaran pupuk P yang rasional. Perlakuan yang dicobakan meliputi aras PPC (F0 = 0 l/ha dan F1 = 3 l/ha PPC ) dan aras TSP (P0 = 0 ku/ha; P1 = 1,5 ku/ha; P2 = 3,0 ku/ha, serta P3 = 4,5 ku/ha TSP). Kedua faktor tersebut dikombinasikan secara faktorial lengkap dengan tiga ulangan. Pupuk N dan K diberikan sebanyak 400 kg/ha urea, 200 kg/ha AS dan 300 kg KCl/ha. Takaran pupuk untuk tanaman keprasan pertama (R1) sama dengan pupuk pada tanaman pertama (PC). Bibit tebu yang digunakan adalah varietas Ps58. Seluruh TSP dan sepertiga pupuk N dan K diberikan pada saat tanam (pada PC) atau satu minggu setelah kepras (R1), sedangkan sisa pupuk diberikan pada saat tanaman berumur 1.5 bulan. Penyemprotan PPC dilakukan pada saat tebu berumur 1,5 dan 3,0 bulan. Hasil penelitian menunjukkan bahwa penggunaan 3l/ha PPC secara mandiri tidak berpengaruh nyata terhadap bobot tebu, rendemen, dan hasil gula baik pada PC maupun R1. Namun demikian, terdapat pengaruh interaksi antara TSP dan PPC terhadap komponen hasil. Pada kondisi tanpa penambahan PPC, TSP nyata mempengaruhi bobot tebu dan hasil gula, tetapi tidak berpengaruh terhadap rendemen. Hasil gula tertinggi (rata-rata 92,0 ku/ha pada PC dan 66,6 ku/ha pada R1) dicapai pada pemupukan TSP 150 - 300 kg/ha. Interpolasi data menunjukkan bahwa aras TSP yang memberikan hasil maksimum di lokasi penelitian adalah 225 kg/ha. Penambahan 3 l/ha PPC mampu mengeliminir respons tanaman terhadap pupuk TSP dengan hasil gula rata-rata sebesar 78,3 ku/ha pada PC dan 58,3 ku/ha pada R1. Dengan kata lain, jika digunakan PPC 3 l/ha, maka tidak ada perbedaan hasil gula pada petak yang dipupuk dengan petak yang tidak dipupuk TSP.

Kata kunci : TSP, pupuk P cair, Ps 58, gula, Subang

An experiment on TSP and Foliar P Fertilizer (PPC) application have been conducted in Cidangdeur, the area of Subang sugar factory. The objectives were (1) to determine effect of PPC and TSP fertilization on the yield of cane, sucrose content, and sugar yield and (2) to ascertain the appropriate dosage of P fertilizer for those area. The treatments were consist of PPC dosages (F0 = without PPC and F1 = with 3 l/ha of PPC) and TSP dosages (P0 = without TSP; P1 = 1.5 qu TSP/ha; P2 = 3 qu TSP/ha; and P3 = 4.5 qu TSP/ha), while Ps 58 cane variety has been use as an indicator plant. Those two factors were combined completley in a split plot design with three replications. Nitrogen and K fertilizer were applied at the rate of 4 qu/ha of urea, 2 qu/ha ZA and 3 qu/ha of KCl. Fertilizer dosage for the first ratoon (R1) was the same as it for plantcane (PC). One third of N and K fertilizer dosage combined with all of TSP were applied at the planting time and the rest of those was given 1.5 months later. At the first ratoon, all of N, P and K fertilizers were applied one week after stuble saving. PPC material was sprayed at 1.5 and 3 months after planting (PC) or stuble saving (R1). The results showed that PPC has no significant effect on the cane weight, sucrose content, or crystal yield both PC and R1. Eventhough, there were the TSP effect and an interaction effect of PPC and TSP on the cane and sugar yield, but not the sucrose content component of PC. Plant showed a good responses to TSP fertilizer when there is no PPC added. Application of 3 qu TSP/ha give the highest cane and sugar yield (1286 qu/ha and 100.5 qu/ha). The respons of PC plants to TSP will be disapeared when 3 l PPC/ha was added. At that condition, the averages cane and sugar yields were 1057 qu/ha and 78.3 qu/ha. Interaction effect of TSP and PPC was also found in the cane yield of R1, but not for other yield component. With no PPC application, the maximum cane yield of R1 (1002.7 qu/ha) was achieved at the dosage of 3 qu/ha TSP fertilization, while addition of 3 l PPC/ha would eliminated those response, with the average cane yield of 807.7 qu/ha.

Key words : TSP, liquid P fertilizer, Ps58, sugar, Subang