Abstract
Field experiments on the fertilizer application in citrus orchards have been conducted in Sinpu and Yuanlin, the ponkan producing centers, since January, 1958. Five treatments i. e., a) PK, b) NK, c) NP, d) NPK, e) NPK + Mg, Mn, Zn, were replicated four or five times in a randomized block layout to determine the effect of three elements as well as the trace elements upon fruit yields and the nutrient contents of leaves. The amounts of fertilizers dressed were based on the conventional application of the local farmers, and ammonium sulphate, calcium phosphate and potassium chloride were used as N, P, K sources respectively. Fruit yields and their number were recorded. Leaves were sampled five times in a year. The results obtained in the first year trial are as follows: 1. Nitrogen would be expected as the most essential element affecting fruityields and potash came to the next. The effect of phosphate was still unapparent. The average fruit yields per tree in the three localities and their indices were calculated as follows; a) PK 35.5 kgs (81), b) NK 46.8 kgs (106), c) NP 36.6 kgs (83), d) NPK 44 kgs (100), e) NPK + T. E. 43,7 kgs (99). 2. The effects of fertilizers upon the weight of unit fruit was not so apparent in those orchards except in Yuanlin where the fruit size was somewhat decreased by the unfertilization of nitrogen. However, the fruit size was differed greatly among these localities, e. g. the mean weight per fruit in Chawmen and Taping were 184 gs and 160 gs respectively, while that in Yuanlin reached 229 gs. The difference might be rather du to the water content in soils than the tree age. 3. The trace element plot had negligible effect in comparison with that of the check plot. It is expected that the detection of significant effects of trace elements may need a long term experiment. Some symptoms of trace element deficiciencies occuring in other orchards seems to justify the necessity of trace elements apart from this experimental result. 4. The N, P, K contents in the leaf samples taken from all the experimental plots at different seasons were analyzed and it was found that the leaves in the no nitrogen plot were generally low in total nitrogen content.
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Claims 16
Claim · model-written summary
Nitrogen was expected to be the most important nutrient for fruit yield.
CitrusNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen would be expected as the most essential element affecting fruityields and potash came to the next”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Potash ranked next in its expected effect on fruit yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen would be expected as the most essential element affecting fruityields and potash came to the next”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The phosphate effect remained unclear.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of phosphate was still unapparent”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The PK plot yielded 35.5 kgs fruit per tree.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a) PK 35.5 kgs (81)”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The NK plot yielded 46.8 kgs fruit per tree.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“b) NK 46.8 kgs (106)”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The NP plot yielded 36.6 kgs fruit per tree.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“c) NP 36.6 kgs (83)”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The NPK plot yielded 44 kgs fruit per tree.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“d) NPK 44 kgs (100)”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The NPK plus trace-element plot yielded 43,7 kgs fruit per tree.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“e) NPK + T. E. 43,7 kgs (99)”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Fertilizer effects on individual fruit weight were generally not apparent.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of fertilizers upon the weight of unit fruit was not so apparent in those orchards”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Omitting nitrogen somewhat decreased fruit size in Yuanlin.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Yuanlin where the fruit size was somewhat decreased by the unfertilization of nitrogen”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Mean fruit weight was 184 gs in Chawmen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mean weight per fruit in Chawmen and Taping were 184 gs and 160 gs respectively”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Mean fruit weight was 160 gs in Taping.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mean weight per fruit in Chawmen and Taping were 184 gs and 160 gs respectively”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Mean fruit weight reached 229 gs in Yuanlin.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Yuanlin reached 229 gs”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Fruit-size variation may have related more to soil water content than tree age.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The difference might be rather du to the water content in soils than the tree age”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
The trace-element plot had negligible effect compared with the check plot.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The trace element plot had negligible effect in comparison with that of the check plot”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
Claim · model-written summary
Leaves without nitrogen generally had low total nitrogen content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaves in the no nitrogen plot were generally low in total nitrogen content”
t0“Citrus Orchards”
e1“fruit yields per tree”
e2“the fruit size was differed greatly among these localities”
The same questions in other papers
nitrogen · yield · CitrusResults differ
16 papers in the same direction as this paper · 4 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- no effect
- negative
17 papers more in this group
See all 21 papers →nitrogen · nutrient: content · CitrusPositive and negative results
6 papers in the same direction as this paper · 3 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- negative
- no effect
6 papers more in this group
See all 10 papers →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.