Application of Rapid Multiplication Technique Using Mini Cutting and NPK Compound Fertilizer to Increase Production of Sweet Potato Cuttings (Ipomoea batatas L.)

Rapid Multiplication Technique (RMT) is a technique used to produce large scale cuttings of sweet potato in a short period by using mini cuttings and proper fertilizer management. The research was carried out from October 2019 to March 2020 and composed of two experiments The first experiment involved a randomized complete block design, with clones (“Ase Kapas” and “Ase Merah”) as the first factor, and tuber weight (150 ± 25 g, 250 ± 25 g, and 350 ± 25 g) as the second factor. The second experiment was arranged in a split-plot design involving different doses of NPK compound fertilizer (as main plot) and different source of cuttings (as subplots). The different doses included NPK 16:16:16 at 100 kg.ha-1 (0.3 g per polybag), 200 kg.ha-1 (0.6 g per polybag), 300 kg.ha-1 (0.9 g per polybag), and without fertilizer as control. The source of cuttings were from the tip, middle and bottom stem of the plants. Results showed that the “Ase Kapas” showed the highest number and the longest shoots, number of nodes, and length of vines. Additionally, tuber weight of ± 350 g produced the highest number of shoots. When it comes to NPK compound fertilizer treatment, a dose of 0.9 g per polybag increased cutting production in “Ase Kapas”, and also responded better to fertilizer treatment. On the other hand, dose of 0.3 g increased cutting production in “Ase Merah”. “Ase Kapas” produced more cuttings from the middle stem, whereas “Ase Merah” produced more cuttings from the . The application of RMT in “Ase Kapas” produced cuttings with ratio of 1:31, which is higher than those in “Ase Merah” with a ratio of 1:17.

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Daya hasil dan indeks panen ubi jalar unggul baru berdaging kuning (Ipomoea batatas L. (Lam.))

Jurnal Agro ◽

10.15575/5704 ◽

2020 ◽

Vol 7 (1) ◽

pp. 24-31

Author(s):

Agung Karuniawan ◽

Reviana Aulia ◽

Haris MAulana ◽

Debby Ustari ◽

Neni Rostini

Keyword(s):

Sweet Potato ◽

Harvest Index ◽

Ipomoea Batatas ◽

Block Design ◽

Total Weight ◽

High Yield ◽

Tuber Weight ◽

Randomized Block Design ◽

Superior Genotypes ◽

Supporting Material

Estimasi daya hasil dan indeks panen dalam pemuliaan tanaman dibutuhkan untuk menyeleksi genotip ubi jalar. Genotip ubi jalar terseleksi yang berdaya hasil tinggi dapat digunakan sebagai bahan pendukung diversifikasi pangan. Tujuan dari penelitian ini adalah untuk memperoleh genotip ubi jalar berdaya hasil tinggi serta memiliki indeks panen tinggi. Penelitian dilaksanakan di Kebun Percobaan Fakultas Pertanian Universitas Padjadjaran Kabupaten Sumedang, Jawa Barat dari bulan November 2018 sampai April 2019. Penelitian ini menggunakan delapan genotip ubi jalar dan tiga genotip pembanding (Ac Putih, Kidal, dan Rancing). Metode yang digunakan adalah rancangan acak kelompok (RAK) dengan 11 perlakuan yang diulang sebanyak tiga kali. Hasil penelitian menunjukkan bahwa jumlah ubi per tanaman, jumlah ubi total, jumlah ubi ekonomis, bobot ubi per tanaman, bobot ubi total dan bobot ubi ekonomis menunjukan perbedaan yang nyata. Terdapat tujuh genotip yang berdaya hasil tinggi yaitu MZ 332, PR 91 (838), Awachy 4, KMDK, IND 38 (48), IND 8 (11), IND 264. Terdapat empat genotip ubi jalar unggul baru yang memiliki hasil indeks panen > 1 yaitu, Mz 332, PR 91(838), KMDK, dan IND 8(11). ABSTRACT Estimation of yield and harvest index on sweet potato are needed to select new superior genotypes of sweet potato in the breeding program. Selected sweet potato genotypes with high yield can be used as supporting material for food diversification. The purpose of this study was to obtain new superior genotypes of yellow-fleshed sweet potato with high yield and high harvest index. The study was conducted in the Experimental field, Faculty of Agriculture, Universitas Padjadjaran, Sumedang Regency, West Java from November 2018 to April 2019. This study used eight sweet potato genotypes as treatment and three genotypes as check i.e. Ac Putih, Kidal and Rancing. The method used was randomized block design (RBD) with 11 treatments repeated three times. The results showed that the numbers of tuber per plant, numbers of tuber per plot, numbers of economic tuber, weight of tuber per plant, total weight per plot, weight of economic tubers were significantly different. There are seven genotypes with the high yield, i.e. MZ 332, PR 91 (838), Awachy 4, KMDK, IND 38 (48), IND 8 (11), IND 264. Four genotypes with harvest index > 1 i.e. Mz 332, PR 91 (838), KMDK, and IND 8 (11).

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Keragaman dan Potensi GenKeragaman dan Potensi Genetik Ubi Jalar Lokal Pada Kondisi Partial Submergenceetik Ubi Jalar Lokal Pada Kondisi Partial Submergence

JURNAL BUDIDAYA PERTANIAN ◽

10.30598/jbdp.2018.14.1.1 ◽

2018 ◽

Vol 14 (1) ◽

pp. 1-7

Author(s):

Helen Hetharie ◽

Simon H T Raharjo ◽

Anna Y Wattimena ◽

Reny Tomasoa ◽

La Dahamarudin

Keyword(s):

Leaf Area ◽

Sweet Potato ◽

Ipomoea Batatas ◽

Block Design ◽

Stem Length ◽

Tuber Weight ◽

Area Index ◽

Randomized Block Design ◽

Vegetative Characters ◽

Individual Tuber

Excess ground water above normal due to high rainfall affect the growth and yields of crops. The objectives of the study were to measure the genetic diversity of local sweet potato clones, to obtain characters of vegetative and yield characters that were responsive against of partial submergence and sweet potato clones that had highest yield components. The method of research was a one-factor experiment involving 21 sweet potato clones using a Completely Randomized Block design with 3 replication. The partial submergence in this study mean that was the lower parts of the plants submerged when the plant were 2 and 3 months old. Data were analyzed with F test, genotype and phenotype variance, and DMRT test. The results show the sweet potato clones have a wide diversities of vegetative and yield characters. Vegetative characters that were positively responsive to partial submergence were the number of green leaves, leaf area per plant, leaf area index, and stem length. Yield characters that were positively responsive to partial submergence were tuber number and tuber length. Some of the clones with the highest production potential were shown through two of the three yields indicators (tubers number, individual tuber weight and tuber weight per plant), i.e. A13, AR15, B9, BSepa-U, BR5, H1 clones and Antin 2 variety.. Keywords: excess water, genotype variance, Ipomoea batatas, Maluku, yield character ABSTRAK Kelebihan air tanah di atas normal akibat curah hujan yang tinggi mempengaruhi pertumbuhan dan produksi tanaman. Tujuan penelitian untuk mengukur keragaman genetik klon-klon ubi jalar lokal, serta mendapatkan karakter vegetatif dan karakter hasil yang responsif positif terhadap partial submergence dan klon ubi jalar yang mempunyai komponen hasil tertinggi. Metode penelitian berupa percobaan satu faktor yaitu 21 klon ubi jalar menggunakan rancangan acak lengkap berblok dengan pengulangan tiga kali. Partial submergence dalam penelitian ini yaitu bagian bawah dari tanaman terendam air pada umur tanaman 2 dan 3 bulan. Analisis data dengan uji F, ragam genotip dan fenotip, dan uji DMRT. Hasil menunjukkan bahwa klon-klon ubi jalar mempunyai keragaman luas pada semua karakter vegetatif dan produksi. Karakter vegetatif yang responsif positif terhadap partial submergence yaitu jumlah daun hijau, luas daun per tanaman, indeks luas daun dan panjang batang. Karakter produksi yang responsif positif terhadap partial submergence yaitu jumlah umbi dan panjang umbi. Beberapa klon dengan potensi produksi melalui dua dari tiga indikator produksi (jumlah umbi, bobot per umbi dan bobot umbi segar per tanaman) tertinggi yaitu A13, A15, B9, BSepa-U, BR5, H1, dan varietas Antin 2. Kata kunci: Ipomoea batatas, karakter hasil, Maluku, ragam genotip, terendam

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Effect of potassium and zinc on growth, yield and economics of sweet potato (Ipomoea batatas L.) cv. CO-34

Journal of Applied and Natural Science ◽

10.31018/jans.v9i1.1186 ◽

2017 ◽

Vol 9 (1) ◽

pp. 291-297

Author(s):

Pravin Singh ◽

Kavita Aravindakshan ◽

I. B. Maurya ◽

Jitendra Singh ◽

Bhim Singh ◽

...

Keyword(s):

Sweet Potato ◽

Ipomoea Batatas ◽

Tuber Yield ◽

Foliar Application ◽

Block Design ◽

Maximum Yield ◽

Growth Yield ◽

Cost Ratio ◽

Average Weight ◽

Four Levels

A field experiment was conducted to study the effect of different levels of potassium and zinc on growth, yield and economics of sweet potato. The experiment was laid out on clay and loam soil by adopting randomized block design with factorial technique (FRBD). The sixteen treatments consisted of combination of four levels of po-tassium (0, 80, 100 and 120 kg/ha through muriate of potash and four levels of foliar zinc (control i.e. water spray, 10, 20 and 30ppm) through zinc sulphate. The individual application of potassium 120 kg K2O/ha significantly in-creased the number of tubers per plant (4.60), average weight of tuber (275.31 g), length of tuber (16.77 cm), diam-eter of tuber (5.69 cm), tuber yield per plot (9.71 kg), tuber yield per hectare (49.04 t) respectively as compared to control. With the foliar application of zinc (30 ppm) significant increase in number of tubers per plant (4.18), average weight of tuber (234.73 g), length of tuber (18.12 cm), diameter of tuber (5.16 cm), tuber yield per plot (8.33 kg) and tuber yield per hectare (42.05 t) was recordedas compared to control. The treatment combination (120 kg K2O+30ppm Zn) recorded the maximum yield parameters i.e. chlorophyll content (37.00 mg/100 g), average weight of tuber (302.17 g), length of tuber (19.82 cm), diameter of tuber (5.97 cm), maximum tuber yield per plot (11.02 kg), tuber yield per hectare (55.67 t) and benefit-cost ratio (B: C ratio) of 4.22:1.While, the treatment (120 kg K2O+30ppm Zn) had the maximum number of tuber (4.86), minimum number of tuber was recorded in control. From the experi-ment, it appeared that application of potassium and zinc can be used to improve yield and higher net monetary re-turns of sweet potato.

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Seleção de genótipos de batata-doce quanto à eficiência ao uso do fósforo em solos da região de cerrado

Journal of Biotechnology and Biodiversity ◽

10.20873/jbb.uft.cemaf.v4n4.silva ◽

2013 ◽

Vol 4 (4) ◽

pp. 356-364

Author(s):

Luziano Lopes Da Silva ◽

Márcio Antônio Da Silveira ◽

Rodrigo Ribeiro Fidelis ◽

Rodrigo de Castro Tavares ◽

Valéria Gomes Momenté ◽

...

Keyword(s):

Experimental Design ◽

Sweet Potato ◽

Ipomoea Batatas ◽

Block Design ◽

Tuberous Root ◽

Phosphorus Fertilization ◽

Germplasm Bank ◽

Randomized Block Design ◽

The Family ◽

Selection Of

The sweet potato (Ipomoea batatas (l.) Lam.) Lam) is a plant that produces tuberous root belonging to the family convolvulácea explored in practically all states of Brazil. The objective of this work was to select genotypes of the sweet potato as the efficiency of phosphorus use in cerrado soils with high and low availability of this nutrient. Were evaluated nine genotypes of sweet potato coming from the germplasm bank from the Federal University of the Tocantins, Brazil. The experimental design was in randomized block design with three replications being nine genotypes grown in two environments with low and high phosphorus availability, using doses of phosphorus fertilization from 20 and 120 kg ha-1 P2O5, applied at planting. To select genotypes suitable for environments proposed was used methodology for selection of the efficient use and response to phosphorus fertilization (efficiency and response). Genotype Amanda was classified as efficient and responsive, Barbara, Julia, Marcela and Carolina Vitoria as efficient, but not responsive and Livia, Duda, Ana Clara and Beatriz were classified as non-efficient, responsive but the absorption and utilization of phosphorus.

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Yield and soil insect resistance in sweet potato clones

Bioscience Journal ◽

10.14393/bj-v35n6a2019-42452 ◽

2019 ◽

Vol 35 (6) ◽

Author(s):

Daiane da Silva Nóbrega ◽

José Ricardo Peixoto ◽

Michelle Souza Vilela ◽

Anne Kelly da Silva Nóbrega ◽

Elaine Caetano Santos ◽

...

Keyword(s):

Sweet Potato ◽

Ipomoea Batatas ◽

Starch Content ◽

Block Design ◽

Titratable Acidity ◽

Soluble Solids ◽

Soil Conditions ◽

Root Yield ◽

Pests And Diseases ◽

Soil Insects

Sweet potato (Ipomoea batatas) is a rustic horticultural crop with high production potential. However, the crop is susceptible to many pests and diseases. The objective of this study was to evaluate 10 genotypes of sweet potato regarding their yield and resistance to soil insects, under Brazilian cerrado soil conditions. Genotypes were selected from the Sweet Potato Germplasm Bank of Embrapa Hortaliças. The experiment was conducted at Água Limpa Farm, belonging to University of Brasilia (UnB), and consisted of a randomized block design, with 10 treatments (genotypes), 10 plants per plot, and four replications. The following traits were analyzed: number of perforations per root, incidence of roots injured by insects, plant resistance degree, root shape, total and marketable root yields, root peel color, root pulp color, pulp total soluble solids, pulp titratable acidity, pulp TSS/TA ratio, pulp moisture, and pulp starch yield. Genotype CNPH 53 (26.78 t ha-1) presented total root yield greater than the commercial variety Brazlândia Rosada (17.54 t ha-1). Genotype Santa Sofia (11.77 t ha-1) and Brazlândia (13.5 t ha-1) had similar marketable root yields. CNPH 53 showed the best agronomic performance, exhibiting moderate susceptibility to soil insects and root shape meeting the market standards. It also had low pulp TA (2.53%); high pulp TSS (12.25 °Brix) and pulp TSS/AT ratio (4.24); pulp moisture content close to 70%; and the highest pulp starch content (11.98%). The traits number of perforations per root, root shape, and pulp TA presented heritability values close to 70%. Marketable root yield, pulp moisture, and pulp starch content demonstrated heritability values greater than 90% and CVG/CVE greater than 1.

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Pengaruh Pupuk Majemuk NPKS dan NPK terhadap Pertumbuhan dan Hasil Padi Sawah pada Inceptisol

Jurnal Penelitian Pertanian Tanaman Pangan ◽

10.21082/jpptp.v34n3.2015.p175-185 ◽

2016 ◽

Vol 34 (3) ◽

pp. 175

Author(s):

Wiwik Hartatik ◽

Ladiyani Retno Widowati

Keyword(s):

Nutrient Uptake ◽

Block Design ◽

Chemical Properties ◽

Dry Weight ◽

Grain Weight ◽

Production Performance ◽

Growth And Yield ◽

Fertilizer Treatment ◽

Optimum Rate ◽

Compound Fertilizer

<p>Rate of NPK fertilization on rice using NPK compound fertilizer needs to consider soil nutrient status and plant nutrient requirement. The research was aimed to determine the optimum rate of compound fertilizer and the effect of enriched S nutrient of NPKS compound (15-15-15-5S) and NPK compound fertilizer (15-15-15) on the growth and yield of rice. The experiments were conducted at two sites in Galuga, Ciampea Bogor, West Java from April to September 2013, using randomised complete block design with 3 replications. Experiment at site I consisted of 9 treatments: six levels of fertilizers NPKS i.e. 0; 150; 300; 450; 600; and 750 kg/ha, standard fertilizer, NPK compound fertilizer equivalent to standard, and standard fertilizer plus S. Rate of urea, SP-36, and KCl for standard fertilizer treatment was respectively 250, 75, and 50 kg/ha. At site II the treatments consisted of 6 levels of NPK compound fertilizer i.e. 0; 150; 300; 450; 600; and 750 kg/ha and the standard fertilizer with rate of 250 kg/ha of urea, 50 kg/ha SP-36, and 75 kg/ha KCl. Plot size was 4 m x 5 m planted with Ciherang variety. Data collection included chemical properties of soil before and after the experiment, plant height, number of tillers, straw weight, and dry grain weight and the nutrient uptake. The effectiveness of fertilizer was calculated by RAE (Relative Agronomic Effectiveness). Results showed that fertilizer NPKS (15-15-15-5S) at 600 kg/ha effectively increased dry grain weight from 3.63 t/ha to 4.67 t/ha, but was not significantly different from a standard fertilizer treatment. It increased dry grain weight by 29% compared to control. NPK fertilizer (15-15-15) effectively promoted growth and dry grain weight equivalent to standard fertilizer at rate of 300-750 kgha. The optimum rate of NPK compound fertilizer (15-15-15) was 440 kg/ha as was shown with the production performance of 4.12 t/ha with RAE by 58%. NPKS compound fertilizer with rate of 750 kg/ha showed the highest uptake of N, P, and K nutrients and significantly increased the available P in the soil. Whereas NPK compound fertilizer with a rate of 600 kg/ha indicated the highest P nutrient uptake. Fertilizer enrichment with sulfur on NPKS fertilizer (15-15-15-5S) did not significant affect on grain dry weight.</p>

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Morphoagronomic characterization of sweet potato accessions from the germplasm bank of Embrapa hortaliças

Bioscience Journal ◽

10.14393/bj-v35n6a2019-42434 ◽

2019 ◽

Vol 35 (6) ◽

Author(s):

Rosa maria de Deus De Sousa ◽

José Ricardo Peixoto ◽

Geovani Bernardo Amaro ◽

Michelle Sousa Vilela ◽

Paula Andrea Osorio Carmona

Keyword(s):

Sweet Potato ◽

Ipomoea Batatas ◽

Agronomic Traits ◽

Block Design ◽

Branch Length ◽

Leaf Color ◽

Germplasm Bank ◽

Immature Leaf ◽

Productive Potential ◽

Branch Weight

Studies on the determination of genetic divergence among genotypes are important tools in breeding programs, contributing to the identification of parents with considerable productive potential. However, little is known about the combinatorial capacity of sweet potato (Ipomoea batatas) accessions and its adaptation to the different regions of Brazil. The objective of this study was to evaluate the morpho-agronomic traits from 102 sweet potato accessions from the Germplasm Bank of Embrapa Hortaliças. The experiment was laid out as an augmented block design comprised of 102 treatments. Nineteen above ground traits were measured using descriptors for the respective parts. Estimated values of broad sense heritability were high for the traits mean branch length (95.75%), immature leaf color (85.06%), and predominant branch color (90.57%). Coefficients of environmental variation were below 30.00% for all variables, except for branch weight (51.62%). The 102 clones analyzed presented broad genetic variability for the different traits evaluated, especially for branch weight, and branch length, and mature leaf color.

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Morpho-agronomic characterization of sweet potato germplasm

Horticultura Brasileira ◽

10.1590/s0102-053620170410 ◽

2017 ◽

Vol 35 (4) ◽

pp. 534-541 ◽

Cited By ~ 1

Author(s):

Rodrigo P Alves ◽

Arie F Blank ◽

Alisson Marcel S Oliveira ◽

Aléa Dayane D Santana ◽

Vanderson S Pinto ◽

...

Keyword(s):

Sweet Potato ◽

Ipomoea Batatas ◽

Agronomic Traits ◽

Phenotypic Variability ◽

Block Design ◽

Leaf Shape ◽

Dry Mass ◽

Good Prospect ◽

Aboveground Part ◽

Potato Germplasm

ABSTRACT Sweet potato (Ipomoea batatas) spreads mainly by vegetative propagation, and therefore this vegetable may have duplicate accessions in germplasm banks. The authors aimed to characterize morpho-agronomically the sweet potato germplasm from the Active Germplasm Bank (AGB) of Universidade Federal de Sergipe (UFS).The experiment was carried out at the Research Farm “Campus Rural da UFS”. The experimental design was a randomized block design, testing 73 sweet potato accessions with two replicates and four plants per plot. Morpho-agronomic traits of aboveground part and roots were evaluated. We observed that the leaf lobe type, the number of lobes per leaf, shape of central lobe, and general leaf shape were traits which provided the most variability among the accessions. For damage caused by soil insects, 52 accessions showed tolerance. The accessions presented a range from 0.33 to 2.71 t/ha for dry mass of aboveground part and from 1.20 to 10.89 t/ha for the total productivity of the roots. The high phenotypic variability of this crop shows good prospect for breeding programs.

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GENETIC DIVERSITY AMONG SWEET POTATO CROPS CULTIVATED BY TRADITIONAL FARMERS

Revista Caatinga ◽

10.1590/1983-21252018v31n329rc ◽

2018 ◽

Vol 31 (3) ◽

pp. 779-790 ◽

Cited By ~ 1

Author(s):

PABLO FORLAN VARGAS ◽

ERIC WATZKE ENGELKING ◽

LUIS CARLOS FERREIRA DE ALMEIDA ◽

ELIEL ALVES FERREIRA ◽

HAMILTON CESAR DE OLIVERIA CHARLO

Keyword(s):

Genetic Diversity ◽

Sweet Potato ◽

Ipomoea Batatas ◽

Block Design ◽

Genetic Material ◽

Morphological Characteristics ◽

Leaf Size ◽

Stem Length ◽

Phenotypic Correlation ◽

Crop Species

ABSTRACT The genetic variability within the crop species Ipomoea batatas is broad, hence, in order to support future breeding programs it is of the utmost importance that germplasm banks be created, conserved, and characterized. Therefore, the objective of this work was to rescue and evaluate the genetic divergence in sweet potato accessions collected in traditional communities of Vale do Ribeira Paulista. Sweet potato samples were collected from quilombos, indigenous villages, caiçaras communities, and small farms. The study was conducted between February 2013 and August 2014 in a randomized block design with three replications. Genetic material included 95 collected accessions and two commercial cultivars. Morphological characteristics of the accessions were evaluated and distances in the genetic distance matrix were estimated by means of multi-category variables, the data being subsequently clustered by the Tocher method. Analysis of the relative contribution of each characteristic and phenotypic correlation of descriptors was also performed. Results evidenced wide genetic diversity among the sweet potato accessions collected in Vale do Ribeira, which were not grouped according to the collection point. The descriptors that contributed more than 60% of genetic diversity included: leaf size, general leaf profile, immature leaf color, petiole pigmentation, predominant branch color, branch secondary color, stem length, cortical thickness, predominant periderm color, and periderm color intensity. Correlations between morphological descriptors was observed in 22.26% of the paired traits.

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Effects of different foliar iron applications on activity of ferric chelate reductase and concentration of iron in sweet potato (Ipomoea batatas)

Crop and Pasture Science ◽

10.1071/cp18371 ◽

2019 ◽

Vol 70 (4) ◽

pp. 359

Author(s):

Xiaoli Tan ◽

Xin Yang ◽

Yinan Xie ◽

Han Xiao ◽

Mengjiao Liu ◽

...

Keyword(s):

Sweet Potato ◽

Ipomoea Batatas ◽

Block Design ◽

Fe Deficiency ◽

Relative Efficacy ◽

Ferric Chelate Reductase ◽

Deficiency Symptoms ◽

Leaf Chlorosis ◽

And Control ◽

Effective Compound

We studied the relative efficacy of different forms of foliar iron (Fe) fertilisation on leaf re-greening in Fe-deficient, purple-fleshed sweet potato (Ipomoea batatas (L.) Lam.) varieties xuzi8 and xuzi6. Activities of ferric chelate reductase (FCR) and concentrations of Fe were measured in the leaves and roots at intervals over 5 days to quantify recovery from leaf chlorosis. Freshly expanded and chlorotic leaves were immersed in one of three different fertiliser compounds containing 9 mm Fe: FeSO4, Fe2(SO4)3, Fe(III)-EDTA. An Fe-sufficient treatment and an Fe-deficient control were included. The experiment had a completely randomised block design with five replications per treatment and was conducted in a sunlit glasshouse. For variety xuzi8, leaf FCR activity in the Fe2(SO4)3 treatment was highest at 1 h after application, and higher than all other treatments, whereas FeSO4 and Fe(III)-EDTA treatments showed their highest FCR at day 5 after application, both significantly higher than the Fe2(SO4)3 and control treatments. Furthermore, leaf Fe concentration reached a maximum in the FeSO4 treatment at day 1, and in the Fe2(SO4)3 treatment at day 3. By contrast, root Fe concentration was relatively constant and lower in the foliar Fe treatments than the Fe-sufficient and -deficient treatments. For variety xuzi6, leaf SPAD was higher with the Fe2(SO4)3 than the FeSO4 treatment at day 5 after application. In general, FCR activity and Fe concentrations in roots and leaves of xuzi6 were higher than those of xuzi8. Variations in leaf Fe concentrations were similar for both the FeSO4 and Fe2(SO4)3 treatments of the two varieties. Maximum leaf Fe levels in xuzi6 were ~4-fold those in xuzi8. The results of the study suggest that foliar-applied Fe2(SO4)3 was the most effective compound at correcting Fe-deficiency symptoms. The higher leaf and root FCR activity and Fe concentration in xuzi6 might explain its higher tolerance to Fe deficiency and better re-greening than xuzi8.

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