1.3 លក្ខខណ្ឌទាក់ទងទៅនឹងការប្រើប្រាស់ទិន្នន័យដែលបានចងក្រងតាមរយៈ វ៉ូខេត

តើពេលណាដែលទិន្នន័យបានចងក្រង (នៅទីវាល)?

01/09/2005

អ្នកចងក្រង និង(បុគ្គលសំខាន់ៗ)យល់ព្រមទទួលយកនូវលក្ខខណ្ឌនានាទាក់ទងទៅនឹងការប្រើប្រាស់ទិន្នន័យដែលបានចងក្រងតាមរយៈវ៉ូខេត:

បាទ/ចា៎

2.1 ការពណ៌នាដោយសង្ខេបពីបច្ចេកទេស

និយមន័យបច្ចេកទេស:

Elimination of burning as a pre-harvest treatment of sugar cane, and managing the resultant trash as a protective blanket to give multiple on and off-site benefits.

2.2 ការពណ៌នាលម្អិតពីបច្ចេកទេស

ការពណ៌នា:

Under conventional production systems, sugar cane is burnt before being harvested. This reduces the volume of trash - comprising green leaves, dead leaves and top growth - making harvesting of the cane simpler, and subsequent cultivation of the soil easier. In the humid tropics of North Queensland, harvesting of cane used to be carried out by hand - as it still is in many parts of the developing tropics. Burning was necessary to make harvesting possible in a dense stand (and to reduce the danger of snakes). However, with the advent of mechanical harvesters in the 1960s, burning continued to be practiced through habit.
A new system then brought fundamental changes in soil management: The ‘green cane trash blanket’ (GCTB) technology refers to the practice of harvesting non-burnt cane, and trash blown out behind in rows by the sugar cane harvester. This trash forms a more or less complete blanket over the field. The harvested lines of cane re-grow (‘ratoon’) through this surface cover, and the next year the cycle is repeated: the cane is once again harvested and more trash accumulates in the inter-rows. Generally the basic cropping cycle is the same, whether cane is burnt or not. This involves planting of new cane stock (cuttings or ‘billets’) in the first year, harvesting this ‘plant crop’ in the second year, and then in years three, four, five and six taking successive ‘ratoon’ harvests. In year six, after harvest, it is still common, even under the GCTB system, to burn the residual trash so that the old cane stools can be more easily ploughed out, and the ground ‘worked up’ (cultivated) ready for replanting. A minority of planters, however, are doing away with burning altogether, and ploughing in the residual trash before replanting. A further variation is not to plough out and replant after the harvest in year six, but to spray the old cane stock with glysophate (a broad spectrum non-selective systemic herbicide) to kill it, then to plant a legume (typically soy bean) as a green manure crop, and only replant the subsequent year after ploughing-in the legume. Under this latter system, one year of harvest is lost, but there are added benefits to the structure and nutrient content of the soil.
Whatever variation of GCTB is used, there are advantages in terms of increased organic matter, improved soil structure, more biodiversity (especially below ground) and a marked reduction in surface erosion - from over 50 t/ha to around 5 t/ha on average. Less erosion is good for the growers - but is also of crucial importance off-site, as sediment lost from the coastal sugar cane strip is washed out to sea, and damages the growing coral of the Great Barrier Reef.

2.3 ​រូបភាពនៃបច្ចេកទេស

2.5 ប្រទេស/តំបន់/ទីតាំងកន្លែង ដែលបច្ចេកទេសត្រូវបានអនុវត្ត និងបានគ្រប់ដណ្តប់ដោយការវាយតម្លៃនេះ

3.2 ប្រភេទដីប្រើប្រាស់មួយប្រភេទ (ច្រើនប្រភេទ) ដែលបានអនុវត្តបច្ចេកទេស

មតិយោបល់:

Major land use problems (compiler’s opinion): Conventional burning of sugar cane before harvest can lead to compaction of top soil and reduced organic matter. There is also, despite the low slopes, a serious problem of sheet/rill erosion that has a negative impact both on the fields, and also off-site on the coral reef.

Major land use problems (land users’ perception): soil erosion, weeds, flooding

3.3 ព័ត៌មានបន្ថែមអំពីអ្នកប្រើប្រាស់ដី

ការផ្គត់ផ្គង់ទឹកនៅកន្លែងអនុវត្តបច្ចេកទេស:

• ទឹកភ្លៀង

ចំនួនសារដែលដាំដំណាំក្នុងមួយឆ្នាំ:

• 1

សូមបញ្ជាក់:

Longest growing period in days: 300

Longest growing period from month to month: Aug - May

3.5 ការសាយភាយនៃបច្ចេកទេស

មតិយោបល់:

Total area covered by the SLM Technology is 800 m2.

Wet tropics region of far north Queensland

3.6 វិធានការ SLM ដែលបញ្ចូលនូវបច្ចេកទេស

3.7 កំណត់ប្រភេទនៃការធ្លាក់ចុះគុណភាពដីសំខាន់ៗដែលបច្ចេកទេសនេះបានដោះស្រាយ

មតិយោបល់:

Main type of degradation addressed: Wt: loss of topsoil / surface erosion, Wo: offsite degradation effects, Cn: fertility decline and reduced organic matter content

3.8 ការពារ កាត់បន្ថយ ឬស្តារឡើងវិញនៃការធ្លាក់ចុះគុណភាពដី

បញ្ជាក់ពីគោលដៅរបស់បច្ចេកទេស ដែលផ្តោតទៅការធ្លាក់ចុះគុណភាពដី:

• ការកាត់បន្ថយការធ្លាក់ចុះគុណភាពដី

មតិយោបល់:

Main goals: mitigation / reduction of land degradation

4.1 គំនូសបច្ចេកទេសនៃបច្ចេកទេសនេះ

4.2 លក្ខណៈពិសេសនៃបច្ចេកទេស/ ពណ៌នាពីគំនូរបច្ចេកទេស

Harvester harvesting cane and depositing trash on surface

Location: Queensland

Technical knowledge required for field staff / advisors: low

Technical knowledge required for land users: low

Main technical functions: control of raindrop splash, improvement of ground cover, improvement of soil structure, control of dispersed runoff

Secondary technical functions: increase in organic matter, increase of infiltration, increase in soil fertility, increase in surface roughness

Mulching
Remarks: "trash blanketing"

4.3 ព័ត៌មានទូទៅដែលពាក់ព័ន្ធនឹងការគណនាធាតុចូល និងថ្លៃដើម

4.6 សកម្មភាពថែទាំ

	សកម្មភាព	ប្រភេទវិធានការ	ពេលវេលា/ ភាពញឹកញាប់
1.	mulching of inter-rows with trash [previously: burn cane with associated trash and then harvest]	ក្សេត្រសាស្ត្រ	August
2.	fertilize cane	ក្សេត្រសាស្ត្រ	October
3.	spray with Amicide (very efficient herbicide, systemic and non-selective)	ក្សេត្រសាស្ត្រ	November
4.	spray with Amicide	ក្សេត្រសាស្ត្រ	January

4.7 កំណត់ថ្លៃដើមសម្រាប់ការថែទាំ/ សកម្មភាពរបស់បច្ចេកទេស (ក្នុងរយៈពេលមួយឆ្នាំ)

មតិយោបល់:

Machinery/ tools: sugar-cane harvester

The year budgeted above is a non-planting year, the costs therefore refer to an established crop which grows
throughout the year and is harvested in August. The assumption is a cane yield of 80 t/ha. Each of the three categories of costing groups machinery, labour (at US$12 per hour) and inputs together. The comparative costs for a burnt cane crop system with the same yield are (a) contract harvesting = US$ 378 (b) fertilizer = US$ 120 (c) herbicide = US$ 56, plus (d) cultivation = US$ 30. Note that under the burnt cane system, soil cultivation/tillage is required, but the cost of harvesting is a little cheaper. The total for the burnt crop system is US$ 584 compared with US$ 543 for the GCTB crop, representing a saving of approx. US$ 40 (around 7%) per hectare per year.

5.1 អាកាសធាតុ

5.2 សណ្ឋានដី

5.3 ដី

5.6 លក្ខណៈនៃអ្នកប្រើប្រាស់ដីដែលអនុវត្តបច្ចេកទេស

សូមបញ្ជាក់ពីលក្ខណៈពាក់ព័ន្ធផ្សេងទៀតអំពីអ្នកប្រើប្រាស់ដី:

Off-farm income specification: various off-farm enterprises undertaken to supplement income during years of poor sugar prices

5.7 ទំហំផ្ទៃដីជាមធ្យមនៃដីផ្ទាល់ខ្លួន ឬជួលគេដែលបានអនុវត្ត​បច្ចេកទេស

5.8 ភាពជាម្ចាស់ដី កម្មសិទ្ធប្រើប្រាស់ដី និងកម្មសិទ្ធប្រើប្រាស់ទឹក

ភាពជាម្ចាស់ដី:

• ឯកជន មានកម្មសិទ្ធ

កម្មសិទ្ធិប្រើប្រាស់ដី:

• ឯកជន

6.1 ផលប៉ះពាល់ក្នុងបរិវេណអនុវត្តបច្ចេកទេសដែលកើតមាន

ផលប៉ះពាល់លើសេដ្ឋកិច្ចសង្គម

ចំណូល និងថ្លៃដើម

ផលប៉ះពាល់ទៅលើវប្បធម៌សង្គម

ផលប៉ះពាល់ទៅលើអេកូឡូស៊ី

វដ្តទឹក/លំហូរ

ដី

6.2 ផលប៉ះពាល់ក្រៅបរិវេណអនុវត្តបច្ចេកទេសដែលកើតមាន

6.4 ការវិភាគថ្លៃដើម និងអត្ថប្រយោជន៍

តើផលចំណេញ និងការថែទាំ/ ជួសជុលត្រូវបានប្រៀបធៀបគ្នាយ៉ាងដូចម្តេច (ទស្សនៈរបស់អ្នកប្រើប្រាស់ដី)?

6.5 ការទទួលយកបច្ចេកទេស

មតិយោបល់:

95% of land user families have adopted the Technology without any external material support

1000 land user families have adopted the Technology without any external material support

There is a little trend towards spontaneous adoption of the Technology

Comments on adoption trend: It is possible that the few growers who persist in burning will eventually adopt the GCTB system through social and environmental pressure.

6.7 ភាពខ្លាំង/ គុណសម្បត្តិ/ ឱកាសនៃបច្ចេកទេស

ភាពខ្លាំង/ គុណសម្បត្តិ/ ឱកាស​ ទស្សនៈរបស់បុគ្គលសំខាន់ៗ
GCTB systems offer multiple on-farm environmental benefits How can they be sustained / enhanced? Continue to refine the system, by encouraging (a) non burning of trash in the
Increases overall farm income by maintaining yields of sugar cane while How can they be sustained / enhanced? Continue to refine the system.
GCTB systems provide protection to the coral reef, through substantially reducing the sediment yield that reaches the lagoon and thence the Great Barrier Reef How can they be sustained / enhanced? Give recognition to the growers for their overall environmental contribution.

6.8 ភាពខ្សោយ/ គុណវិបត្តិ/ ហានិភ័យនៃបច្ចេកទេស និងវិធីសាស្ត្រដោះស្រាយ

ភាពខ្សោយ/ គុណវិបត្តិ/ ហានិភ័យ ទស្សនៈរបស់អ្នកចងក្រងឬបុគ្គលសំខាន់ៗ	តើបច្ចេកទេសទាំងនោះបានដោះស្រាយបញ្ហាដូចម្តេច?
Some burning still continues through (a) the few farmers who have not yet adopted GCTB and (b) the common practice of burning trash before replanting	Continue to encourage non-burning for multiple reasons.

7.2 ឯកសារយោងដែលបានចេញផ្សាយ

ចំណងជើង អ្នកនិពន្ធ ឆ្នាំ ISBN:

Mullins JA, Truong PN and Prove BG (1984) Options for controlling soil loss in canelands – some interim values. Proc. Aust. Soc. Sugar Cane Technol., 6: 95–100

ចំណងជើង អ្នកនិពន្ធ ឆ្នាំ ISBN:

Vallis I, Parton WJ, Keating BA and Wood AW (1996) Simulation of the effects of trash and N fertilizer management on soil organic matter levels and yields of sugarcane. Soil and Tillage Research. 38: 115–132

ចំណងជើង អ្នកនិពន្ធ ឆ្នាំ ISBN:

Wood AW (1991) Management of crop residues
following green harvesting of sugarcane in north Queensland. Soil Till. Res. 20: 69–85