Daily Capacity will be expressed the value on a farm work by several sets of machine with operators in the several field blocks on a day. In manual farm work, Daily Capacity will be expressed the value by a group of several workers.

1. Daily Capacity

 

DC = EFC * Dn                                 Eq. 2-26

Dn = Dt * (NWR / 100)                       Eq. 2-27

From above two equations,

DC = EFC * Dt * (NWR / 100)           Eq. 2-28

Where,

symbol	term	unit
DC	Daily Capacity	ha/d
EFC	Effective Field Capacity	ha/h
Dn	Net Work hours per day	h/d
Dt	Working hours per day	h/d
NWR	Daily net working rate	%

 

1. Example: Table 241. Daily Capacity of farm work

Table 241. Daily Capacity of farm work

Work Name	Machinery	Effective Field Capacity	Work capacity	Work hour per day	Net Work rate	Net Work hours	Daily Capacity
		EFC	WC	Dt	NWR	Dn	DC
	unit	ha/h	h/ha	h/d	%	h/d	ha/d
Land preparation	Walking Tractor + Rotary	0.083	12.0	8.0	75	6.0	0.50
Weeding	Manual	0.009	111.1	8.0	80	6.4	0.06
Sowing	Walking Tractor + 2-Row Seeder	0.126	7.9	8.0	65	5.2	0.66
Trans-planting	Rice transplanter	0.036	27.8	10.0	73	7.3	0.26
Chemical application	Boom sprayer	0.273	3.7	8.0	75	6.0	1.64
Harvesting	Head-feeding combine	0.052	19.2	8.0	68	5.4	0.28

Exercise. 2-14

 

2. Daily working hours

 

Dt = Dn + Dp + Ds + Dc + Df + Da + Dm + Dr + Db              Eq. -1

Where,

symbol	term	unit
Dt	Total daily working hours	h
Dn	Net working hours	h
Dp	Preparation time of work	h
Ds	Time for setting	h
Dc	Time for cleaning of farm machines	h
Df	Time for feeding	h
Da	Adjustment time	h
Dm	Moving or traveling time	h
Dr	Repairing time	h
Db	Short brake time or time for non operation or lunch time	h

 

1. Example: Table 242.

Table 242. Actual survey of daily work hours

(Harrowing by disk harrow, and plowing)

Items	Clock Time			Items of required hours											Area	Remarks
	Starting time	Ending time	Net hours	Net Working hours: Dn		Other extra hours
				Plow	Disk harrow	Dp	Db	Ds		Dc+ Df	Da	Dm		Dr
	h.min														ha	ha/h
Garage-Field 1	7.02	7.19	17					2		10			5
Field 1	7.19	9.53	2.34	2.31		3									0.445	0.178
Field 2	9.53	11.15	1.22	1.07		3	10						2		0.164	0.15
Field 2-Garage	11.15	11.44	29			4	9			10			6			fueling
Lunch Time	11.44	13.31	1.47				1.47
Garage-Field 3	13.31	13.39	8			1							4	3
Field 3	13.39	17.00	3.21	3.19		2									0.5	0.151
Field 3-Garage	17.00	17.12	12					7					4	1
Garage-Field 1	17.12	17.21	9										5	4
Field 1	17.21	18.34	1.15		1.14									1	0.445	0.361
Field 1-Garage	18.3	18.53	17					2		10			5
Total (min)	7.2	18.53	711	417	74	13	126	11		30			31	9	1.11	0.16
Rate (%)			100	58.6	10.4	1.8	17.7	1.5		4.2			4.4	1.3
	Daily net working rate								69.0 %

 

Where, Dt: Total daily working hours

Dn: Net working hours

Dp: Preparation time of work

Ds: Time for setting

Dc: Time for cleaning of farm machines

Df: Time for feeding

Da: Adjustment time

Dm: Moving or traveling time

Dr: Repairing time

Db: Short brake time or time for non operation or lunch time

Exercise. 2-15

3. Daily net working rate

 

NWR = Dn / Dt * 100                            Eq. 2-30

Where,

symbol	term	unit
NWR	Daily net working rate	%
Dn	Net working hours	h
Dt	Total daily working hours	h

 

1. Example: Table 243a.

Exercise. 2-16

 

Table 243a. Standard Value of Daily Net Working Rate

Name of operation	Daily Net Working Rate (%)						Main equipment
	One operator			Two operators
	Distribution of field			Distribution of field
	Small	Mid.	Large	Small	Mid.	Large
plowing	66	69	72	78	81	84	Suki, Bottom plow, Rotary
Harrowing & leveling	68	71	73	80	83	85	Disk harrow, Rotary tooth harrow
Pressing	70	73	76	81	84	86	Roller, Culti- packer
Puddling	63	66	70	75	78	80	Rake, Puddling-rotor. Rotary
Fertilizer & sowing	55	60	65	70	74	77	Manure spreader, Lime sower, Broad-caster, Grain drill
Rice transplanting	59	63	67	70	75	80	Rice transplanter
Chemical spray (liquid water)	62	64	66	69	73	75	Power mist sprayer
Chemical spray (duster)	69	73	75	73	78	82	Power duster
Chemical spray (granule)	72	76	80	80	84	88	Knapsack type power duster, Manual broad-caster
Reaping	62	65	68	72	76	80	Power reaper
Reaping & binding	60	63	66	70	74	78	Reaper binder
Harvesting & threshing	58	62	65	68	72	76	Head feeding combine.
Threshing	70	75	80	75	80	85	Self feeding thresher (Threshing in the field)
Husking	85	85	85	85	85	85	Automatic husker (in-door operation)
Transporting	75	73	80	80	83	85	Trailer

Table 243a was estimated by following condition.

(1) If two operator, it can reduce in time for attaching equipment to tractor, cleaning time, adjustment and repair time.

(2) Small, Mid and Large means distribution of field, Large means 100 ha with 5 distribution plots, middle means 50 ha with 3 distribution plots, small means 30 ha with one plots. Traveling speed of tractor in 8 km/hr and others are 5 km/hr.

(3) These net work rates are calculated in Japanese condition.

 

2. Example: Table A-243b. Example of calculation for Net Work Rate in appendix
4. What factors affect on the daily capacity

 

1. Farm work type (Crop and customs of farmer etc.)
2. Weather condition (Length of daytime, temperature etc.)

Table 244b. Working hours per day in Japan

month North latitude (name of place	January	February	March	April	May	June	July	August	September	October	November	December
26.13 (Naha, Okinawa)	8.8	8.4	9.0	9.9	10.5	10.8	10.6	10.0	9.3	8.5	7.8	7.5
35.30 (Tokyo, Ibaraki)	7.1	7.9	9.0	10.1	11.0	11.5	11.3	10.6	9.4	8.4	7.5	6.9

See Table A-244b. for other place of Japan in appendix

Remarks: This average monthly operation hours are decided from monthly average sun shining hours deduct 3 hours for lunch time and lest time.

 

3. Labor Standard Law: 8 hours per day in Japan
4. Scattering of fields

Field map

 

5. Farm road

Table 244e. Farm road conditions

Effective width	machine width + 1 m	Standard
	>2.5 m	Tractor (30PS)
	>3.0 m	Tractor (40-80PS)
	>4.0 m	Tractor (>90PS)
Junction width	>3 m
Height between paddy field and road	<30cm	Tractor
	<20cm	Combine(0.8-1.2m)
	<25cm	Combine(1.2-3.5m)
	<40cm	Combine(>3.5m)

When field area=2 ha, total time required a farm work=5 h, obtain Effective Field Capacity and Work Capacity.

When field area=20a, total time required a farm work=50min, obtain Effective Field Capacity and Work Capacity.

Exercise 2-3.

When field area=1.2 ha, actual operating time required a farm work=1.5 h, Obtain Effective Field Capacity and Work Capacity.

When rice grain 800kg was produced in 30min by thresher. Yield of rice was 4t/ha. Obtain Effective Field Capacity of this thresher.

In plowing of the field (40*30 m), data of times required was as follows.

Obtain Total operating time, and Effective field capacity.

When Wt and Vt were as follows, obtain theoretical field capacity.

Exercise 2-7.

Obtain theoretical operation width of weeding by rotary weeder (width=45cm), when row width is 70 cm.

Exercise 2-8.

Obtain Field Efficiency in percentage, when EFC=1.3, TFC=1.7 (ha/h).

Exercise 2-9.

Obtain Field Efficiency in percentage, in Exercise 2-5.

Exercise 2-10.

Obtain Total time of labor and Effective Field capacity of a set of threshing, when A = 0.2 ha, time required of machie=0.7 h, number of workers=3.

Exercise 2-11.

Obtain Effective Field capacity of manual weeding, when A = 0.2 ha, time required =0.6 h, number of workers=5.

Exercise 2-12.

Obtain Effective Field capacity and Work capacity in case of tillage by power tiller, when W=0.6m, V=1.8km/h, EF=70%.

Exercise 2-13.

Show the effect of size of field (A=0.1, 0.3, 0.5, 1.0 ha),and the effect of shape of field ( m=1, 2, 3.3) in the rotary tillage in upland as follows.

Use next equation. EFC = A / {4.72*A + 0.358* SQRT(A/m) + 0.164}

Exercise 2-14.

Obtain Daily Capacity and Net Work hours per day, when Dt=8h, NWR =70% and EFC=0.2 ha/h.

Exercise 2-15.

Show working hours per day in your countries.

Exercise 2-16.

Obtain Daily Net Work Rate (NWR) using following data.