Viticulture in Ireland

Thursday, 1 September 2022

Brix increasing in Rondo

I re-tested the red Rondo grapes and got consistent readings of 17. I tried testing the Solaris but got nothing. The Chardonnay grapes don't appear to be anywhere near veraison although it's hard for the untrained eye to discern veraison in white grapes.

It's hot again today, forecast to reach 18C, but it's much hotter than that in the sun. There has been little rainfall, but we're expecting potentially heavy rain tomorrow and daily for the next week. The Pinot Noir vines are showing stress (yellow leaves) and the Albarino is stunted in growth again. I'm afraid that when the rain does come, it will shock the grapes and dilute the juices which at the moment are delicious and concentrated.

Rondo getting close

Pinot Noir nowhere near

Chardonnay vines showing effects of drought

Albarino stunted

7 yo vines doing just fine

Monthly values for NEWPORT up to 31-aug-2022

Total rainfall in millimetres for NEWPORT

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
2022	98.8	260.4	67.8	84.0	107.0	148.0	59.2	104.1	n/a				929.3
2021	225.6	147.6	141.1	45.6	113.5	64.1	59.7	155.6	137.0	265.7	183.3	186.6	1725.4
2020	139.5	342.8	178.2	25.5	54.7	164.5	187.9	137.9	153.4	228.0	206.6	232.7	2051.7
2019	146.8	115.0	228.5	100.7	112.5	76.6	82.7	228.9	175.5	160.7	148.1	220.6	1796.6
LTA	166.7	126.5	141.2	96.8	94.7	89.7	100.9	132.5	131.5	176.0	170.4	180.2	1607.1

Mean temperature in degrees Celsius for NEWPORT

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
2022	7.2	7.1	8.0	9.9	12.6	13.8	15.9	16.2	n/a				11.4
2021	5.0	6.7	7.9	9.0	10.4	13.3	17.5	16.4	15.2	11.9	9.3	7.6	10.9
2020	7.2	6.0	6.6	11.0	12.8	13.8	14.4	16.0	13.8	10.5	9.1	6.1	10.6
2019	6.9	8.4	7.9	10.2	11.7	13.1	16.3	15.5	13.7	10.3	7.1	7.1	10.7
LTA	6.1	6.1	7.3	9.0	11.5	13.8	15.4	15.4	13.5	10.8	8.3	6.5	10.3

Mean 10cm soil temperature for NEWPORT at 0900 UTC

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
2022	6.2	6.2	6.3	9.3	13.2	14.8	16.8	16.6	n/a				11.2
2021	3.6	5.0	6.8	8.2	10.9	14.3	17.9	16.3	15.2	11.3	8.6	6.6	10.4
2020	5.7	4.7	5.4	9.7	13.0	14.8	14.9	16.3	13.7	9.5	8.0	5.1	10.1
2019	6.1	6.1	6.8	8.9	12.2	13.8	16.7	15.7	13.5	9.4	6.2	5.6	10.1
LTA	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a

Global Solar Radiation in Joules/cm² for NEWPORT

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
2022	6311	10756	33399	40555	51569	47246	48439	51169	n/a				289444
2021	6620	13347	20370	45694	55690	45488	49455	40490	22413	16358	7235	3780	326940
2020	6263	10808	24545	46192	58476	43537	40215	40555	25558	18487	6319	5209	326164
2019	5378	10595	21306	37648	49884	49607	45395	37116	26460	17406	8167	4766	313728
LTA	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a

Potential Evapotranspiration (mm) for NEWPORT

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
2022	13.7	23.0	47.2	60.6	77.7	76.0	80.4	82.0	n/a				460.6
2021	7.6	22.9	30.7	62.9	76.3	70.7	87.8	67.5	38.3	25.1	14.1	14.6	518.5
2020	17.6	21.9	35.0	70.2	91.6	72.9	66.2	66.4	42.7	28.1	13.6	10.4	536.6
2019	13.4	21.5	35.4	60.4	79.0	78.2	79.5	62.9	42.8	29.2	14.8	14.3	531.4
LTA	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a

Evaporation (mm) for NEWPORT

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
2022	17.9	32.4	66.5	86.8	114.5	109.2	111.1	113.2	n/a				651.6
2021	10.9	32.1	45.4	89.9	111.2	102.0	117.2	93.5	52.1	34.7	18.6	19.1	726.7
2020	22.4	31.9	51.8	98.9	130.8	104.8	94.3	92.7	59.1	38.8	18.1	13.6	757.2
2019	17.7	29.5	52.0	87.3	111.6	112.8	109.6	88.8	59.9	39.6	18.9	17.9	745.6
LTA	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a

Degree Days Below 15.5 Degree Celsius for NEWPORT

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Total
2022	256	234	235	171	97	63	30	28	N/A	N/A	N/A	N/A	N/A
2021	325	247	236	200	167	79	20	23	40	114	187	245	1883
2020	257	276	275	143	111	73	55	31	71	156	193	291	1935
2019	266	200	235	165	130	89	27	36	67	164	251	262	1892

Notes on the Data

Evaporation and PE data are calculated using Penman/Monteith formulae.
The ‘LTA’ (referred to within a table) is average for the climatological long-term-average (LTA) reference period 1981-2010.
Data updated daily at Mid-day.

Open data

Cumulative Rainfall Graphs

Temperature Departures from LTA

Sunday, 28 August 2022

Grape testing

I tested a bunch of grapes that had turned deep red and got a Brix reading of 14. Since the optimal sugar content for red wine is Brix 22, we have a little time left before we harvest. I will take readings every other day for the next week and daily after that.

The white grapes seem far behind the red Rondo. The photo coming up is of Chardonnay. Brix should reach 20 if it's to be wine. Not sure what will happen.

The next two are Solaris. They are on the younger vines. The older vines didn't do much. Weird. But it's possible veraison has begun there. I will test them next time, but there won't be much of a harvest.

The two coming up are Pinot Noir. Some of the vines seems to be infected with something - looks like powdery mildew to me. Others look fine. There are no Albarino grapes coming.

The roses in the garden are all looking good, so we don't have a major fungal intrusion.

This page is really good at helping to identify problems.

The apple harvest is underway and the donkeys are loving the periodic small apple donations. It's a good year for apples. But we've lost our pear trees to disease. It's also our first harvest of hazelnuts. I am so excited. They were on the younger of the two trees. Go figure.