Abstract
Abstract Tea (Camellia sinensis L.) grown in China often suffers from severe seasonal drought in the summer causing drastic effects on productivity. In a field trial, the effect of potassium (K) fertilization on summer tea yields during 1992–1994 was studied and related to the weather conditions of the respective years. Summer tea yields of 1994 (dry year) increased significantly at K2 (300 kg K2O‐ha‐1) compared to the Kl treatment (150 kg K2O ha‐1). In contrast, only marginal effects were observed by increasing K application from Kl to K2 in the years with adequate water availability (1992 and 1993). During the latter maximum tea yields were already achieved with Kl. In addition, a pot experiment was conducted in order to investigate the interaction between the soil water regime and K availability in the soil on tea biomass production. Soil moisture was maintained at 45, 55, 65, 75, and 85% of the field capacity (FC) and K levels were 0 and 500 mg K2Okg‐1. No tea plant survived at the 45% FC level whereas all tea plants survived at or above 75% FC. The survival rate increased substantially in the K treated tea plants under moderate drought stress conditions (55% and 65% FC). The dry matter production was significantly larger with increasing soil moisture and at the high K status in the soil. This observation was most pronounced under water stress conditions. The study indicates that under moisture stress, increased survival, improved dry matter production and yields of tea plants were due to improved K bioavailability following K application. Furthermore, larger amounts of K are required under moisture stress conditions compared to normal water supply.
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Claims 9
Claim · model-written summary
In the dry year 1994, summer tea yields increased significantly at 300 kg K2O/ha compared with the lower K treatment.
Verbatim
t0“growth of tea”
e1“Summer tea yields of 1994 (dry year) increased significantly at K2 (300 kg K2O”
e2“compared to the Kl treatment”
e3“In a field trial”
Claim · model-written summary
In the years with adequate water (1992 and 1993), raising K application from Kl to K2 had only marginal effects.
- Taxon
- teat0
- Treatment
- increasing K application from Kl to K2e1
- Outcome
- marginal effectse1
- Qualifier
- years with adequate water availability (1992 and 1993)e1
- Setting
- field triale3
Not reportedComparatorDirection
Verbatim
t0“growth of tea”
e1“only marginal effects were observed by increasing K application from Kl to K2 in the years with adequate water availability (1992 and 1993)”
e3“In a field trial”
Claim · model-written summary
In the years with adequate water, maximum tea yields were already reached with the Kl treatment.
Verbatim
e1“maximum tea yields were already achieved with Kl”
Claim · model-written summary
In the pot experiment no tea plant survived at 45% field capacity, whereas all survived at 75% field capacity or above.
Verbatim
e1“No tea plant survived at the 45% FC level whereas all tea plants survived at or above 75% FC”
Claim · model-written summary
K-treated tea plants had a substantially higher survival rate under moderate drought stress (55% and 65% field capacity).
- Taxon
- teae1
- Treatment
- K treatede1
- Outcome
- survival ratee1
- Direction
- increasede1
- Qualifier
- moderate drought stress conditions (55% and 65% FC)e1
Not reportedComparator
Verbatim
e1“The survival rate increased substantially in the K treated tea plants under moderate drought stress conditions (55% and 65% FC)”
Claim · model-written summary
Dry matter production of tea was significantly larger with increasing soil moisture, most strongly under water stress.
- Taxon
- teat0
- Treatment
- increasing soil moisturee1
- Outcome
- dry matter productione1
- Direction
- largere1
- Qualifier
- most pronounced under water stress conditionse2
Not reportedComparator
Verbatim
t0“growth of tea”
e1“The dry matter production was significantly larger with increasing soil moisture”
e2“This observation was most pronounced under water stress conditions”
Claim · model-written summary
Dry matter production of tea was significantly larger at the high soil K status, most strongly under water stress.
- Taxon
- teat0
- Treatment
- high K status in the soile1
- Outcome
- dry matter productione1
- Direction
- largere1
- Qualifier
- most pronounced under water stress conditionse2
Not reportedComparator
Verbatim
t0“growth of tea”
e1“The dry matter production was significantly larger with increasing soil moisture and at the high K status in the soil”
e2“This observation was most pronounced under water stress conditions”
Claim · model-written summary
The authors attribute increased survival, improved dry matter production and higher yields of tea plants under moisture stress to improved K bioavailability after K application.
Verbatim
e1“under moisture stress, increased survival, improved dry matter production and yields of tea plants were due to improved K bioavailability following K application”
Claim · model-written summary
Larger amounts of K are required for tea under moisture stress than under normal water supply.
Verbatim
t0“growth of tea”
e1“larger amounts of K are required under moisture stress conditions compared to normal water supply”
The same questions in other papers
soil water · yield · Camellia sinensis (black tea)Positive and negative results
1 in the opposite direction
- negative
potassium · yield · Camellia sinensis (black tea)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.