scholarly journals Study the effect of two organic fertilizers, methods of fertilization on productivity, pests and predatory insects associated with eggplant under modified climatic condition

2021 ◽  
Vol 16 (1) ◽  
pp. 170-185
Author(s):  
Fatma S Moursy ◽  
Doaa AM Gad ◽  
Dalia Adly ◽  
Ihab I Sadek
Keyword(s):  
Humic Acid ◽  
Nitrogen Content ◽  
Phosphorus Content ◽  
Total Yield ◽  
Fruit Weight ◽  
Stem Diameter ◽  
Compost Tea ◽  
Fresh Weight ◽  
Number Of Leaves ◽  
Predatory Insects

This study investigated the effects of two organic fertilizer (compost tea and humic acid) compared to chemical fertilizer on plant growth, productivity, pests and predatory insects associated with eggplant Solanum melongena var. Black beauty under net house in 1st of April at 2019 and 2020 seasons. Application of fertilizers through fertigation enhanced significantly number of leaves, stem fresh weight, average fruit weight and total fruit yield. Moreover, stem diameter, nitrogen content in leaves (%), phosphorus content in leaves (%), potassium content in leaves (%), number of fruits and total yield were enhanced significantly due to using compost tea. However, using the humic acid cause a significant enhancement in number of shoots, number of leaves, stem diameter and leaves fresh weight. In addition, application of compost tea through the fertigation cause a significant superiority in number of shoots, nitrogen content in leaves (%), phosphorus content in leaves (%), potassium content in leaves (%), number of fruits, average fruit weight and total yield. The highest significant values of leaves fresh weight and stem dry weight were mainly due using humic acid through foliar application. Three main pest species and seven different predators' species were recorded associated with pests on eggplant. The application of foliar and fertigation compost tea increased pest populations significantly compared with humic acid and control. But also, increase the predators' population.

scholarly journals Effect of Humic Acid on Growth and Productivity of Tomato Plants Under Heat Stress

2017 ◽  
Vol 25 (2) ◽  
pp. 59-66 ◽  
Author(s):  
Islam Mohamed Yassin Abdellatif ◽  
Youssef Youssef Abdel-Ati ◽  
Yousry Tammam Abdel-Mageed ◽  
Mohamed Abdel-Moneim Mohamed Hassan
Keyword(s):  
Heat Stress ◽  
Humic Acid ◽  
Total Yield ◽  
Fruit Weight ◽  
Summer Season ◽  
Soluble Solids ◽  
Fresh Weight ◽  
Tomato Plants ◽  
Fruit Number ◽  
Continental Climate

Abstract The purpose of this study was to evaluate the effect of humic acid (HA) applied at 4.8, 9.6 and 14.4 kg·ha−1 on the growth and productivity of two tomato hybrids Nema 1400 and Platinium 5043 under hot continental climate. HA was applied twice to soil: the first one – three weeks from transplanting and the second one, after one week from the first application, in both seasons. Application of HA during the summer season targeted a great results on tomato plant growth and productivity. HA at 14.4 kg·ha−1 in-creased the vegetative growth of tomatoes (plant height and fresh weight) and flowering parameters (number of flower clusters and flowers per plant) as well as yield characters (fruit number per plant and fruit weight, which resulted in higher early and total yield) in both seasons. HA application had the least impact on fruit number per plant, and on vitamin C and total soluble solids (TSS) concentration as compared with control.

scholarly journals Evaluation of Sweet Pepper (Capsicum annum L.) Varieties as Influnced by Nitrogen Levels in Chitwan, Nepal

2020 ◽  
Vol 14 (1) ◽  
pp. 33-42
Author(s):  
Santosh Lohani ◽  
Moha Dutta Sharma ◽  
Shree Chandra Shah ◽  
Arjun Kumar Shrestha
Keyword(s):  
Block Design ◽  
Total Yield ◽  
Growth Yield ◽  
Sweet Pepper ◽  
Fruit Weight ◽  
Chemical Fertilizer ◽  
Nitrogen Levels ◽  
Randomized Complete Block Design ◽  
Number Of Leaves ◽  
Better Than

An experiment was conducted to assess the performance of sweet pepper varieties as influenced by nitrogen levels from August 2014 to February 2015 at Mangalpur, Chitwan. The experiment was laid out in two factorial Randomized Complete Block Design (RCBD) with three replications having sixteen treatments. Varieties and levels of nitrogen significantly affected growth, yield and qualitative parameters of fruits. Hybrid Indra and NS 632 performed better than open pollinated varieties viz. Sagar and California Wonder. Days to fifty percent flowering of NS 632 were earlier than California Wonder. Indra variety had the highest plant height (52.18 cm), number of secondary branches per plant (13.51) from 250 kg N/ha through chemical fertilizer while number of leaves per plant was higher in NS 632 variety (57.22) than Sagar variety (47.37). Indra variety showed the highest fruit weight (87.59 g) and total yield (39.45 t/ha) but NS 632 variety produced more number of fruits per plant (9.25) than California Wonder variety. This study showed that sweet pepper yield of hybrid varieties applied with 250 kg N/ha through chemical fertilizer was appropriate dose to get optimum yield under Chitwan condition.

scholarly journals Pertumbuhan dan produksi Okra merah (Abelmoschus esculentus L. Moench) pada dosis pupuk kompos serasah yang berbeda dan pemangkasan

2018 ◽  
Vol 2 (2) ◽  
pp. 180
Author(s):  
Rifna Nur Habiba ◽  
Widyati Slamet ◽  
Eny Fuskhah
Keyword(s):  
Interaction Effect ◽  
Fruit Weight ◽  
Stem Diameter ◽  
Abelmoschus Esculentus ◽  
Basic Design ◽  
Number Of Leaves ◽  
Leaf Compost ◽  
Range Test

The research aims was to investigate the interaction between dose of leaf compost and pruning on the growth and production of red okra. The research was assigned in basic design of completely randomized 4x2 factorial with three replications. The first factor was doses of leaf K (0, 50, 100, 150 kg N / ha). The second factor was pruning P (unpruned and pruned), each treatment was repeated three times. The parameters measured were stem diameter, number of leaves, number of fruits per plant, number of fruit per plot, and fruit weight per plot,. The data were analyzed statistically by of variance followed by Duncan's Multiple Range Test (DMRT). The results showed that there was no interaction effect at treatment doses of compost litter and pruning. Dosage of compost litter of 50 kg N / ha can increase the growth of girth, number of leaves, and the number of fruit per plot. Litter compost fertilizer dose of 100 kg N / ha can promote the growth and production of red okra. Pruning treatment can increase the production of red okra. Keywords : red okra, compost, leaf, pruning. 

scholarly journals Pertumbuhan dan Hasil Tanaman Terung Ungu Varietas Yumi F1 dengan Pemberian Berbagai Bahan Organik dan Lama Inkubasi pada Tanah Berpasir

2013 ◽  
Vol 12 (2) ◽  
pp. 6-12
Author(s):  
Titin Apung Atikah
Keyword(s):  
Plant Height ◽  
Rice Husk ◽  
Sandy Soil ◽  
Organic Materials ◽  
Fruit Weight ◽  
Chicken Manure ◽  
Fruit Crops ◽  
Fresh Weight ◽  
Number Of Leaves ◽  
Incubation Duration

The research aims to study the response of plant purple eggplant F1 Yumi variety by providing various organic materials and the proper incubation duration on sandy soil. This research used Completely Randomized Factorial Design. The first factor is giving various organic materials (chicken manure, and kayambang bokashi manure + rice husk charcoal) and the second is the incubation duration (2.4 and 6 weeks before planting). The results showed that providing various organic materials and the incubation duration highly significant influence on plant height and number of leaves aged 4 and 6 weeks after planted, the number of productive branches and fresh weight of fruit crops, but did not significantly affect the parameters of plant height and number of leaves aged 2 WAP. The highest yield for plant height parameter aged 4 and 6 WAP, number of leaves aged 4 and 6 WAP, number of productive branchs, number of fruits and fresh fruit weight was obtained at bokashi manure + rice husk charcoal treatment with 4 weeks incubation duration before planting.

scholarly journals Effect of Biochar and Compost from Chicken, Goat, and Cow Manure on Cultivation of Red Chili (Capsicum annuum L)

2020 ◽  
Vol 4 (2) ◽  
pp. 95-101
Author(s):  
Kadek Adi Mahendra ◽  
Yohanes Parlindungan Situmeang ◽  
Made Suarta
Keyword(s):  
Sea Level ◽  
Treatment Effect ◽  
Block Design ◽  
Fruit Weight ◽  
Growth And Yield ◽  
Cow Manure ◽  
Fresh Weight ◽  
Randomized Block Design ◽  
Compost Application ◽  
Number Of Leaves

Abstract   This study aims to determine the effect of compost and biochar fertilizer at a dose of 15 tons ha-1 made from livestock manure and its interaction on the growth and yield of red chili plants. This research was conducted in Blahkiuh Village, Abiansemal District, Badung Regency, Bali with an altitude of 400-500 m above sea level. This research was started from February 2020 to July 2020. The design used in this study was a factorial randomized block design (RBD) consisting of 2 factors, namely: chicken compost with 4 levels and biochar 2 levels by testing the types of compost and biochar. The interaction between the treatment effect with the type of compost and the type of chicken biochar had no significant effect on all observed variables. The treatment of compost application had a significant to very significant effect on most of the observed variables, except for the number of leaves, which had no significant effect. The treatment of chicken biochar dosing had a significant to very significant effect on most variables except for the maximum number of leaves and fresh weight per fruit, which had no significant effect. The results showed that the highest fresh fruit weight was obtained in the type of compost given by chicken livestock, namely 1499.56 g or an increase of 46.46% compared to the lowest treatment obtained without compost, namely 1023.85 g. To increase the growth and yield of red chili plants, it is recommended to use compost types of chicken livestock and chicken biochar at a dose of 15 tonnes ha-1 and further research is needed on the provision of biochar and compost types at different locations and types of plants.   Keywords:  compost, biochar, and chili plants.

scholarly journals The influence of fertilizer type and time of application on growth and forage productivity of mung bean

2017 ◽  
Vol 1 (01) ◽  
pp. 22-28
Author(s):  
ARD ALSHAM ADAM MOHAMMEDALTOM ◽  
YASSIN MOHAMED IBRAHIM DAGASH
Keyword(s):  
Mung Bean ◽  
Dry Weight ◽  
Organic Manure ◽  
Stem Diameter ◽  
Application Time ◽  
Fresh Weight ◽  
Time Of Application ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Number Of Branches

Mohammedaltom AAA, Dagash YMI. 2017. The effect of fertilizer type and time of application on growth and forage productivity of mung bean. Asian J Agric 1: 22-28. A field experiment was conducted on April 3, 2016, at the Demonstration Farm of College of Agricultural Studies, Sudan University of Sciences and Technology, Shambat, Khartoum, Sudan to study the effect of some fertilizers and their time of application on growth and forage productivity of mung bean. The treatments were arranged factorially in split-plot trial with four replications. Application time was assigned to the main plot as three times of application: before sowing, with sowing and after sowing. Types of fertilizers as the sub plot including four types of fertilizers: without fertilizer (control), 50 kg ha-1 (organic manure), 100 kg ha-1 (diammonium phosphate), and 10 L ha-1 (humic acid). Different characters were measured include plant height (cm), stem thickness (cm), number of branches/plant, number of leaves/plant, fresh weight/plant (g) as well as dry weight/plant (g). The results revealed that there is a highly significant difference for types and application time of fertilizers and their interaction on plant height, number of leaves, and fresh forage and dry forage. Highly significant differences (p ≤ 0.01) were recorded in types of fertilizers and interaction between different application time and types of fertilizers for number of branch and significant difference (p ≤ 0.05) of application time for number of branch and stem diameter. There was no significant difference in types of fertilizers for stem diameter. The highest height of the plant (28.78 cm), the highest number of branches/plant (9.37), the maximum stem diameter (6.43 cm), the largest number of leaves/plant (31.69), the best fresh weight (815 kg ha-1) and dry weight (161 kg ha-1) were recorded for the treatment of 50 kg ha-1 organic manure applied after sowing.

scholarly journals Pengaruh Jenis dan Dosis Pupuk Hayati Mikoriza terhadap Pertumbuhan dan Hasil Tanaman Cabai (Capsicum annuum L.) pada Tanah Andisol Lembah Seulawah Aceh Besar

2020 ◽  
Vol 5 (2) ◽  
pp. 101-110
Author(s):  
Ahmad Mizan Matondang ◽  
Jumini Jumini ◽  
Syafruddin Syafruddin
Keyword(s):  
Plant Height ◽  
Glomus Mosseae ◽  
Root Colonization ◽  
Dry Weight ◽  
Fruit Weight ◽  
Stem Diameter ◽  
Growth And Yield ◽  
Yield Potential ◽  
Fresh Weight ◽  
Banda Aceh

Abstrak. Penelitian ini bertujuan untuk mengetahui pengaruh jenis dan dosis pupuk hayati mikoriza yang tepat terhadap pertumbuhan dan hasil tanaman cabai merah pada tanah Andisol Lembah Seulawah Aceh Besar. Penelitian ini dilaksanakan di Kecamatan Lembah Seulawah, Kabupaten Aceh Besar,  Rumah Kaca, Laboratorium Ilmu dan Teknologi Benih dan Laboratorium Fisiologi Tumbuhan Fakultas Pertanian Universitas Syiah Kuala, Darussalam Banda Aceh yang berlangsung sejak bulan Mei sampai dengan Oktober tahun 2019. Analisis data yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok pola Faktorial dengan kombinasi 3 x 3 dengan 3 ulangan sehingga didapat 9 kombinasi perlakuan dan mencakup 27 unit percobaan. Faktor yang diteliti yaitu  jenis pupuk hayati mikoriza yang terdiri dari 3 taraf yaitu Glomus mosseae, Gigaspora sp. dan Campuran (Glomus mosseae dan Gigaspora sp.) dan dosis mikoriza yang terdiri dari 3 taraf yaitu 5, 10 dan 15 g per tanaman dan dilanjutkan dengan uji lanjut Beda Nyata Terkecil pada taraf 5%. Hasil penelitian menunjukkan bahwa perlakuan jenis mikoriza berpengaruh sangat nyata terhadap parameter diameter batang 15 HSPT dan panjang buah serta berpengaruh nyata pada tinggi tanaman 15 HSPT, diameter batang 45 HSPT, jumlah cabang produktif, berat buah, persentase kolonisasi mikoriza dan potensi hasil. Perlakuan jenis mikoriza dari pertumbuhan dan hasil tanaman cabai terbaik dijumpai pada jenis mikoriza campuran. Pada perlakuan dosis mikoriza berpengaruh sangat nyata terhadap parameter tinggi tanaman 30 dan 45 HSPT, diameter batang 30 HSPT, jumlah cabang produktif, berat basah tanaman, berat kering tanaman, berat basah akar, berat kering akar, berat buah, panjang buah, jumlah buah, persentase kolonisasi akar dan potensi hasil serta berpengaruh nyata pada diameter batang 45 HSPT. Perlakuan dosis mikoriza dari pertumbuhan dan hasil tanaman cabai terbaik dijumpai pada dosis mikoriza 10 g per tanaman. Terdapat interaksi yang nyata antara perlakuan jenis dengan dosis mikoriza terhadap jumlah cabang produktif tanaman cabaiEffect of Mycorrhizal Biofertilizer Type and Dosage Against Growth and Yield of Chilli (Capsicum annuum L.) on Andisol Soil Valley in Aceh BesarAbstract. This research aims to understand the type and doses of fertilizer biological mycorrhiza on growth and crop yield on the ground chili in the Andisol Seulawah valley Aceh Besar. This research was conducted in the Seulawah valley district of Aceh Besar, Greenhouse The Science and Technology Seeds and Laboratory of Plant Physiology, Syiah Kuala University Faculty of Agriculture Banda Aceh Darussalam held since october 2019. Data analysis used in this study is the random groups (shelf) factorials patterns by a combination with 3 x 3 test until they reached 9 combination treatment and 27 unit experiment. The research of fertilizer biological mycorrhiza consisting 3 kinds of standard that were Glomus mosseae, gigaspora sp. And blend (Glomus mosseae and gigaspora sp.) and dosage mycorrhiza consisting of 3 standard that were 5, 10, 15 g / plant and continued with the Smallest Significant Difference  test at the 5% level . The results of this research were the treatment of mycorrhiza type had a very significant effect on plant height parameters stem diameter 15 DAP and fruit length and this research had a significant effect on plant height parameters 15 DAP, stem diameter 45 DAP, number of productive branches, fruit weight, percentage of root colonization and yield potential. The best mycorrhiza treatment of growth and yield of chili plants is found in mixed mycorrhiza types. In the treatment of dosage has a very significant effect on plant height parameters 30 and 45 DAP, stem diameter 30 DAP, number of productive branches, plant fresh weight, plant dry weight, root fresh weight, root dry weight, fruit weight, length fruit, number of fruits, percentage of root colonization and yield potential. The best mycorrhiza dose treatment of chili growth and yield was found on mycorrhiza dose of 10 g per plant. The interaction between the treatment of mycorrhiza types and dosage have a very significant on number of productive branches. 

Optimizing planting density for cut Helianthus annuus and Zinnia elegans

2019 ◽  
pp. 1-4
Author(s):  
Muhammad Modassar Sharif ◽  
Irslan Ali ◽  
Iftikhar Ahmad
Keyword(s):  
Helianthus Annuus ◽  
Leaf Area ◽  
Zinnia Elegans ◽  
Stem Diameter ◽  
Vase Life ◽  
Plant Canopy ◽  
Plant Spacing ◽  
Fresh Weight ◽  
Number Of Leaves ◽  
Flower Quality

A study was conducted to optimize plant spacing for cut Helianthus annuus cv. Pro Cut Orange and Zinnia elegans cv. Double Super Yoga. Seedlings were raised in 128-celled plastic plug trays containing coco coir, compost and silt (1:1:1; v/v/v) as substrate. At 2-4 true leaf stage, seedlings were transplanted outdoors in thoroughly tilled and leveled flat beds at plant and row spacing of 15.0 × 15.0, 15.0 × 22.5, 22.5 × 22.5, 22.5 × 30.0, or 30.0 × 30.0 cm with plant populations of 40, 26, 17, 13 or 10 plants per m2, respectively. Experiments were laid out in randomized complete block design with three replications individually for each species. Findings revealed that for Helianthus annuus, plants grown at 15.0 × 15.0 cm spacing produced tallest plants with greatest plant canopy diameter. While leaf area, stem diameter and vase life were highest for plants spaced at 30.0 × 30.0 cm. Plant spacing had no effect on number of leaves per plant, fresh weight of stem, flower quality and internodal distance. Similar results were recorded when this experiment was repeated on Helianthus annuus during next year for confirmation of results. In case of Zinnia elegans, plants spaced at 30.0 × 30.0 cm exhibited highest plant canopy diameter, number of leaves per plant and number of flowers per plant, while plants spaced at 15.0 × 15.0 cm had highest plant height and leaf area. Flower diameter, stem diameter, flower quality, internodal distance, fresh weight of a stem and vase life were similar irrespective of plant spacing. Based on the findings, it can be concluded that quality cut Helianthus annuus production was greatly improved when plants were spaced at 15.0 × 15.0 cm, while 30.0 × 30.0 cm spacing was optimal for cut Zinnia elegans production and may be used for commercial cultivation of Helianthus and Zinnia in Punjab.

scholarly journals Pengaruh waktu pemangkasan pucuk dan sisa buah setelah penjarangan terhadap hasil produksi tanaman semangka (Citrullus vulgaris schard)

2019 ◽  
Vol 3 (1) ◽  
pp. 55
Author(s):  
Anita Dwi Yuriani ◽  
Eny Fuskhah ◽  
Yafizham Yafizham
Keyword(s):  
Factorial Design ◽  
Plant Height ◽  
Fruit Weight ◽  
Fresh Fruit ◽  
Fresh Weight ◽  
Citrullus Vulgaris ◽  
Number Of Leaves ◽  
Food Nutrition ◽  
Sugar Levels ◽  
Fruit Diameter

ABSTRACT  The objective of this research was to know growth and the production of watermelon plants through the treatment of pruning time on shoots and the amount of residual fruit after thinning. The research was carried out on Klaten Watermelon Clay, located in Genukan Village, Wedi Sub-district, Klaten District, and at the Laboratory Chemistry and Food Nutrition Faculty of Animal and Agricultural Sciences, Diponegoro University from February to May 2017. The research was arranged using completely randomized factorial design with the first factor being shoot pruning time (P1 = no trimming, P2 = 3rd week, P3 = 6th week, P4 = 3rd and 6th week) and the second factor was the rest of the fruit after thinning (Q1 = without thinning, Q2 = thinning leaves 1 piece, Q3 = thinning leaves 2 pieces). The results showed the treatment of pruning of shoots and the remaining fruit after spacing did not affect the growth plant height and number of leaves watermelon until 8th week. However pruning of shoots 3rd week and 6th week can affect fruit diameter, fresh fruit weight, and fruit sugar levels. Treatment of the remaining fruit after the spacing is pruned 2 pieces affect the diameter of fruit and fresh weight of fruit while the rest of the fruit after spacing is purned 1 pieces fruit affect the fruit sugar levels. Keywords: watermelon, pruning, thinning, production ABSTRAK  Penelitian bertujuan untuk mengetahui pertumbuhan dan hasil produksi tanaman buah semangka melalui perlakuan waktupemangkasan pada pucuk dan jumlah sisa buah setelah penjarangan. Penelitian ini dilaksanakan pada di lahan Sahabat Semangka Klaten, yang terletak di Desa Genukan, Kecamatan Wedi, Kabupaten Klaten, dan di Laboratorium Kimia dan Gizi Pangan Fakultas Peternakan dan Pertanian Universitas Diponegorodari bulan Juli - September2017. Penelitian disusun menggunakan rancangan acak lengkap factorial dengan faktor pertama adalah waktu pemangkasan pucuk (P1 = tanpa pemangkasan, P2 = minggu ke 3, P3 = minggu ke 6, P4 = minggu ke 3 dan 6) danfaktor kedua adalah sisa buah setelah penjarangan (Q1 = tanpa penjarangan, Q2 = penjarangan disisakan 1 buah, Q3 = penjarangan disisakan 2 buah). Hasil penelitian menunjukan perlakuan pemangkasan pucuk dan sisa buah setelah penjarangan tidak mempengaruhi pertumbuhan tinggi tanaman dan jumlah daun semangka sampai minggu ke 8. Namun pemangkasan pemangkasan pucuk minggu ke 3 dan 6 mempengaruhi diameter buah, bobot segar buah, dan kadar gula buah. Perlakuan sisa buah setelah penjarangan yang dijarangkan 2 buah mempengaruhi diameter buah dan bobot segar buah sedangkan sisa buah setelah penjarangan yang dijarangkan 1 buah mempengaruhi kadar gula buah.Kata Kunci: semangka, pemangkasan, penjarangan, produksi 

scholarly journals INFLUENCE OF HUMIC ACID (HEMO BLES) ON PLANTS’ GROWTH OF TOMATO (LYCOPERSICON ESCULENTUM)

2020 ◽  
Vol 14 (4) ◽  
pp. 117-120
Author(s):  
Ahmad Suliman ◽  
Aleksandr Abramov ◽  
Anna Shalamova
Keyword(s):  
Ascorbic Acid ◽  
Humic Acid ◽  
Dry Matter ◽  
Biochemical Properties ◽  
Fruit Weight ◽  
Area Index ◽  
Tomato Plants ◽  
Number Of Leaves ◽  
Growth Development ◽  
Object Of Study

This article presents the results of two years of research (2017-2018) on the effects of the growth regulator Hemo bles (humic acid - 85%) on the growth, development and productivity of tomato plants in greenhouses. The object of study is the tomato Big Beef F1. Middle-ripening, indeterminate type. Tomatoes were grown according to generally accepted technology in greenhouse conditions. When studying the effect of humic acid on tomato plants, the treatment was carried out in concentrations (250 mg/l, 500 mg/l, 700 mg/l), 3 times, with an interval of 30 days. This experiment was aimed at studying the effect of spraying with humic acid (Hemo bles) on the vegetative growth, flowering and fruiting of a tomato. Spraying of plants was carried out after 30, 60 and 90 days. Data collection: Ten plants from each repetition (out of 3) were selected to measure the following parameters: plant height (cm), number of leaves per plant, leaf area index LAI (m2/plant), chlorophyll content (chromometer) and fruit weight (g). Biochemical properties were evaluated at the stage of fruit ripening; dry matter was calculated by weighing the fruits before drying and after drying at 105° C; ascorbic acid (AA) was determined by 2,6-dichlorophenolindophenol. As a result of studies, it was found that the use of humic acid increases the productivity of tomato plants.

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