Te Arapiki Ako
"Towards better teaching & learning"

Case study One: The Speights Stubby Grassometer

Comment on this item  
Add to your favourites
Remove from your favourites
Add a note on this item
Recommend to a friend
Comment on this item
Send to printer
Request a reminder of this item
Cancel a reminder of this item
Share |
Last updated 26 October 2012 15:29 by NZTecAdmin

Ken explained, ‘You need to carry out 15 to 20 measurements over a paddock.”

Immediately I recognised that Ken was familiar with the “Teaching Adults to Reason Statistically Progressions.” The more random measurements you try the greater is your confidence in the results of the survey (see page 27)."

“If the grass reaches the top of the label you can say for certain that the dry matter yield will be 2500 kilograms per hectare,” added Ken. For townies, dry matter is the food component of grass with the water removed. A hectare (ha) is an area of 100 metres x 100 metres (10 000 metres squared).

Providing proper grazing is essential to the profitability of farms and the welfare of animals. Normally a cow eats about 17.5 kg of dry matter per day. Stocking rates of about three cows per hectare are usual in New Zealand. An optimal residue of dry matter that leaves the pasture healthy after grazing is 1500 kg/ha (kilograms per hectare).This gives the simple formula:

(3 cows/ha x 17.5 kg/cow x number of days) + 1500kg/ha = pre-grazing cover.

So if Ken knows the pre-grazing cover is 2500kg of dry matter/ha he can work out the number of days that his cows can feed on that pasture.

3 cows/ha x 17.5 kg/cow x d (days) + 1500kg/ha = 2500kg/ha

So the pasture will last 1000/3 x 17.5 ≈ 19 days

Simple – Yeah Right! (getting our beers mixed up)

It’s just as well that Ken and his fellow farming tutors at Telford Polytechnic recognise the numeracy required to work this out. Rates like kg/ha are found at steps 5 and 6 of the numeracy progressions. There is more to farming than milking cows.

Thank goodness for the Speights Stubby test. It’s all tax deductable as well and the resource is definitely renewable.

Read More >>>



13 December 2017 04:13
Thanks a lot for sharing this case study here, my friend. As one of the top workers at the http://www.topaperwritingservices.com/ site, all of this study will be a lot useful to me and I am thankful to you for that. Continue the tremendous work!
27 January 2018 07:51
This case study was very interesting to read. I got caught up in some of the moments in this case and that's a great thing. If I get the time, I'll share this with my friends. https://oscars2018updates.com/
12 February 2018 02:02
12 February 2018 02:03
16 February 2018 17:36
watch fifa world cup live streaming free online. You will recieve many updates regarding FIFA 2018 on this website. https://www.fifaworldcuplivestreaming.net/
01 March 2018 12:00
We are the Academy 🎥 of Motion Picture Arts & Sciences and we champion the power of human imagination For all things #Oscars , 🎬🎞️visit: https://oscars-2018.com/
03 March 2018 08:25
Don’t miss the 2018 Academy Awards, hosted by Jimmy Kimmel, live on ABC and corresponding streaming platforms beginning with red carpet coverage at 6:30 p.m. ET on Sunday, March 4. The 2018 Oscars will air live from the Dolby® Theatre in Hollywood, California, USA. Don’t miss a minute as Jimmy Kimmel hosts Hollywood’s biggest night! If you don’t want to miss a second of the glitz, glamour, and excitement, we’ve got you covered with the lowdown on how to stream the annual awards ceremony. Academy Awards 2018 Live Stream. http://www.academyawards2018live.club/
06 March 2018 09:49
ACC Men's Basketball Tournament https://acc-tournament.com/
Only registered users may comment. Log in to comment

Search this section

Knowing the Demands Knowing the Learner Knowing the What to Do

News feeds

Subscribe to newsletter