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Pemupukan merupakan salah satu komponen teknologi yang penting dalam upaya peningkatan produksi padi,namun teknologi rekomendasi pemupukan yang digunakan selama ini kurang spesifik. PHSL adalah aplikasi berbasis komputer yang dapat digunakan untuk memperoleh rekomendasi pemupukan yang spesifik lokasi. Kajian dilakukan untuk mengetahui keragaan pertumbuhan, produksi, dan aspek ekonomi penerapan teknologi PHSL pada lahan sawah irigasi di Sulawesi Tenggara. Kajian dilakukan melalui kaji terap dengan membandingkan antara teknologi pemupukan berdasarkan PHSL dengan teknologi pemupukan berdasarkan kebiasaan petani selama dua musim tanam yaitu pada MH 2011/2012 (Oktober 2011 – Januari 2012) pada luasan 4 ha yang melibatkan 40 orang petani dan MK 2012 (Juli – November) pada luasan 21,4 ha melibatkan 25 orang petani di Kecamatan Uepai Kabupaten Konawe.Hasil kajian menunjukkan bahwa jumlah anakan produktif dan hasil padi sawah yang menggunakan rekomendasi pemupukan PHSL lebih tinggi dan berbeda nyata sementara jumlah gabah hampa lebih rendah dan berbeda nyata dibandingkan dengan teknologi petani. Produktivitas padi yang menggunakan rekomendasi pemupukan PHSL lebih tinggi 20% - 34% dibandingkan dengan teknologi eksisting petani. Aplikasi PHSL relatif baik dalam menentukan dosis pupuk N, P dan K dengan tingkat pencapaian target produksi mencapai 87,5% pada MT I dan 89,5% pada MT 228 Jurnal Pengkajian dan Pengembangan Teknologi Pertanian, Vol. 19, No.3, November 2016: 227-241 II. Penerapan teknologi PHSL memberikan perbedaan keuntungan sebesar Rp3.912.200 pada MT I dan Rp2.838.700 pada MT II. Nilai MBCR pada MT I dan MT II masing-masing 5,12 dan 5,70, menunjukkan rekomendasi pemupukan PHSL layak diterapkan.

Irrigated rice (Oryza sativa L.) and wheat (Triticum aestivum L.) yield increases in Punjab, India, have slowed in recent years. Future yield increases may occur in smaller increments through fine-tuning of crop management mainly by accounting for the large spatial and temporal variation in soil characteristics. On-farm experiments were conducted from 2002-03 to 2004-05 at 56 sites in six key irrigated rice-wheat domains of Punjab to evaluate an approach for site-specific nutrient management (SSNM). Site-specific N–P–K applications were calculated by accounting for the indigenous nutrient supply, yield targets, and nutrient demand as a function of the interactions between N, P, and K. The performance of SSNM was tested for two rice and two wheat crops. Compared with the current farmers’ fertilizer practice (FFP), average grain yields increased from 5.1 to 6.0 and 4.2 to 4.8 Mg/ha for rice and wheat crops, respectively, while plant N, P, and K accumulations increased by 12 to 20%. Improved timing and/or splitting of fertilizer N increased N recovery efficiency from 0.20 and 0.17 kg/kg in FFP plots to 0.30 and 0.27 kg/kg in SSNM plots in rice and wheat crops, respectively. The agronomic N use efficiency was 63 to 83% greater with SSNM than with FFP. The gross return above fertilizer cost (GRF) was 13-14% greater with SSNM than with FFP. Future SSNM research must build on the present approach to develop a more practical way for achieving similar benefits across large areas without site-specific modeling and with minimum crop monitoring.

Irrigated rice (Oryza sativa L.) and wheat (Triticum aestivum L.) yield increases in Punjab, India, have slowed in recent years. Future yield increases may occur in smaller increments through fine-tuning of crop management mainly by accounting for the large spatial and temporal variation in soil characteristics. On-farm experiments were conducted from 2002-03 to 2004-05 at 56 sites in six key irrigated rice-wheat domains of Punjab to evaluate an approach for site-specific nutrient management (SSNM). Site-specific N–P–K applications were calculated by accounting for the indigenous nutrient supply, yield targets, and nutrient demand as a function of the interactions between N, P, and K. The performance of SSNM was tested for two rice and two wheat crops. Compared with the current farmers’ fertilizer practice (FFP), average grain yields increased from 5.1 to 6.0 and 4.2 to 4.8 Mg/ha for rice and wheat crops, respectively, while plant N, P, and K accumulations increased by 12 to 20%. Improved timing and/or splitting of fertilizer N increased N recovery efficiency from 0.20 and 0.17 kg/kg in FFP plots to 0.30 and 0.27 kg/kg in SSNM plots in rice and wheat crops, respectively. The agronomic N use efficiency was 63 to 83% greater with SSNM than with FFP. The gross return above fertilizer cost (GRF) was 13-14% greater with SSNM than with FFP. Future SSNM research must build on the present approach to develop a more practical way for achieving similar benefits across large areas without site-specific modeling and with minimum crop monitoring.