Perceived improvements in nitrogen fertilizer efficiency from cotton precision farming

Torbett, J. Colby; Roberts, Roland K.; Larson, James A.; English, Burton C.

doi:10.1016/j.compag.2008.04.003

Cited by 16 publications

(14 citation statements)

References 24 publications

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“…Adsett di dalam Yu Li dan Kushwaha (1994) menyatakan bahwa akan sangat menguntungkan bila tingkat kandungan nitrat dalam tanah dapat diketahui sehingga pemakaian pupuk nitrogen dapat disesuaikan dengan kebutuhan. Atas dasar inilah dikembangkan teknologi variable rate nitrogen fertilizer (VRNF) untuk menghindarkan kekurangan atau kelebihan pupuk pada suatu bagian lahan/ hamparan pertanian (Torbett et al, 2006).…”

Section: Pendekatan Masalahunclassified

Aplikasi Kontrol Digital Untuk Pemupukan Secara Variable Rate Pada Sistem Pertanian Presisi

Manalu¹

2019

JSTI

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Precision agriculture has many facets including guidance, yield mapping, variable rate application and remote sensing. Variable rate nitrogen fertilization is a technique being developed for fertilizer application in recent years. One of the main problems in variable rate nitrogen fertilization is controlling the fertilizer application rate according to the soil nitrate level. In this paper, a digital control system for variable rate nitrogen fertilization is presented. A pole-placement controller design based on the simplified process model is used in this system. The system dynamic response of the pole-placement controller was simulated under the condition with torque disturbance and the condition without torque disturbance. The digital controller was then implemented into a prototype system and the dynamic response of the control system was tested under different torque disturbance conditions. The control system performed at acceptable levels under small external torque disturbance conditions. However, under large torque disturbances, the steady-state offset error in the system response was not acceptable and the use of a robust controller for both tracking control and disturbance rejection was recommended. This paper presents a simulation of the use of digital control for variable rate fertilization The benefits of using variable rate technology are very clear. Low yielding areas of the field are no longer over fertilized resulting in reduction of costs in those areas.Pertanian presisi memiliki banyak aspek diantaranya pengukuran, pemetaan hasil, aplikasi laju tidak tetap dan penginderaan jarak jauh. Pemupukan nitrogen secara laju tidak tetap (variable rate) adalah teknik yang dikembangkan untuk aplikasi pemupukan dalam beberapa tahun terakhir. Salah satu masalah utama dalam pemupukan nitrogen secara laju tidak tetap yaitu mengontrol jumlah pemakaian pupuk agar sesuai dengan kandungan nitrat tanah. Tulisan ini menyajikan studi tentang aplikasi sistem kontrol digital untuk pemupukan nitrogen secara laju tidak tetap dalam kerangka pertanian presisi (precision farming). Sebuah desain kontroler tiang-penempatan didasarkan penyederhanaan modelnya digunakan dalam sistem ini. Sistem respon dinamik dari pengontrol tiang-penempatan disimulasikan pada kondisi dengan gangguan torsi dan kondisi tanpa gangguan torsi. Kontrol digital kemudian diimplementasikan ke dalam sistem prototipe dan respon dinamik dari sistem kontrol diuji di bawah kondisi gangguan torsi yang berbeda. Sistem kontrol dilakukan pada tingkat yang dapat diterima dalam kondisi gangguan torsi eksternal yang kecil. Namun, di bawah gangguan torsi besar, kondisi steady yang mengimbangi kesalahan dalam respon sistem tidak dapat diterima. Tulisan ini menyajikan simulasi penggunaan kontrol digital untuk pemupukan secara variable rate. Tujuan penggunaan teknologi variable rate adalah agar lokasi dengan produktivitas rendah tidak lagi dipupuk secara berlebihan sehingga mengurangi biaya.Keywords: fertilization, digital control, variable rate, precision farming.

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Section: Pendekatan Masalahunclassified

Aplikasi Kontrol Digital Untuk Pemupukan Secara Variable Rate Pada Sistem Pertanian Presisi

Manalu¹

2019

JSTI

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“…Therefore, cotton farmers are likely to be more familiar with the data and the usefulness of this information in evaluating changes in fertilizer use following the adoption of VRT. Torbett et al (2007Torbett et al ( , 2008 found that farmers who used grid or zone soil sampling ranked more highly the importance of PA in reducing N, P, and K use in cotton production. Given the Torbett et al (2007Torbett et al ( , 2008 findings and that farmers typically move from whole-field application based on a yield goal to a grid-or zone-based fertilizer plan, those who adopt this site-specific information technology will more likely reduce fertilizer use with VRT management.…”

Section: Site-specific Information Technologiesmentioning

confidence: 99%

“…Several other site-specific information technologies, soil maps (SM), aerial photos (AE), satellite imagery (ST), and yield monitors (YM), may also influence changes in fertilizer use. As with grid or zone soil sampling, Torbett et al (2007Torbett et al ( , 2008 found that cotton farmers who used these technologies ranked more highly the importance of PA in reducing N, P, and K use. Nevertheless, a priori predictions about their effects on fertilizer use were difficult given that the data provided by these technologies have less of a direct link to the VRT fertilizer management plan compared to grid or management zone soil sampling.…”

Section: Site-specific Information Technologiesmentioning

confidence: 99%

“…Research finds that PA technologies are more likely profitable in fields exhibiting high spatial variability, or when the crops grown are high-value or input-intensive (Swinton & Lowenberg-DeBoer, 1998). The soils on which cotton is typically grown in the Southern United States exhibit considerable variability and are conducive to management using PA technologies (Larson et al, 2008;Torbett et al, 2007Torbett et al, , 2008. Applying inputs according to crop and/or soil needs using PA technologies may lead to increased input-use efficiency in fields with extensive variability (Roberts et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…College education was the only variable associated with nitrogen productivity, suggesting that other unobserved factors such as soil quality influenced differences in input productivity. Torbett et al (2007Torbett et al ( , 2008 evaluated the factors influencing farmer perceptions of the importance of PA technologies in reducing nitrogen (N), phosphorus (P), and potassium (K) use in cotton production. Farmers who used yield monitors, management zone soil sampling, grid soil sampling, and on-the-go sensing were more likely to rate highly the importance of PA technologies in reducing N, P, and K use.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variable-Rate Application on Fertilizer Use in Cotton Production

Thompson¹,

Larson²,

Velandia³

et al. 2018

JAS

Self Cite

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Precision agriculture technologies are increasingly important in cotton production because input prices continue to rise. Farmers increase input efficiency using precision agriculture technologies by adjusting inputs to match soil fertility and plant nutrition requirements. This research examines the factors affecting changes in fertilizer use following variable-rate fertilizer application in cotton production. Data from a 2009 survey of cotton producers in 12 states of the United States were used in the analysis. Farmers who used precision soil sampling, planted larger cotton area, relied on other farmers for information about PA, grew picker cotton, and had higher household income were more likely to decrease fertilizer application with VRT. Results from this analysis are useful to farmers and policy makers interested in reducing fertilizer use in the face of rising fertilizer prices and growing concerns about the environmental impacts of farming.

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Ecological Fertilization

Füleky¹,

Benedek²

2010

Alternative Farming Systems, Biotechnology, Drought Stress and Ecological Fertilisation

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Perceived improvements in nitrogen fertilizer efficiency from cotton precision farming

Cited by 16 publications

References 24 publications

Aplikasi Kontrol Digital Untuk Pemupukan Secara Variable Rate Pada Sistem Pertanian Presisi

Aplikasi Kontrol Digital Untuk Pemupukan Secara Variable Rate Pada Sistem Pertanian Presisi

Variable-Rate Application on Fertilizer Use in Cotton Production

Ecological Fertilization

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