Source: UNIVERSITY OF PUERTO RICO AT MAYAGUEZ submitted to NRP
COVER CROPS AND PRECISION AGRICULTURE MANAGEMENT EFFECTS ON GIANT KEY LIME GROWN ON CONTRASTING SOIL TYPES
Sponsoring Institution
National Institute of Food and Agriculture
Project Status
COMPLETE
Funding Source
Reporting Frequency
Annual
Accession No.
1012538
Grant No.
(N/A)
Cumulative Award Amt.
(N/A)
Proposal No.
(N/A)
Multistate No.
(N/A)
Project Start Date
May 10, 2017
Project End Date
Mar 31, 2020
Grant Year
(N/A)
Program Code
[(N/A)]- (N/A)
Recipient Organization
UNIVERSITY OF PUERTO RICO AT MAYAGUEZ
P. O. BOX 9000
MAYAGUEZ,PR 00681
Performing Department
Agroenvironmental Sciences
Non Technical Summary
In Puerto Rico, erosion and other soil degradation agents are found in citrus farms where intensive tillage has been performed to establish new orchards, in farms established in steep slopes and/or in towns with high annual precipitation. Other major challenges encountered in new citrus orchards are reduced efficiency of plant water use, nutrient loss due to runoff events, growth of unwanted land cover between trees and between tree rows, and subsequently, excessive use of herbicides resulting in vegetation removal and bare soil. The use of cover crops as an agricultural conservation practice and use of unmanned aerial vehicles (UAVs) as a precise agricultural management tool are valuable practices to overcome soil degradation, water loss and to improve soil quality and health. In addition UAVs can be used to monitor diseases such as citrus greening (CG), which has been affecting citrus orchards since 2001 causing a steady drop in citrus production and, in some cases, death of the trees. This drop has been experienced primarily in orange and mandarin varieties rather than in lime or lemon varieties even though the trees have been infected with CG. For that reason, Giant Key lime grafted onto HRS 812 rootstock will be used, in combination with the use of cover crops and UAV technology, to grow experimental trees in contrasting soil types to determine their ability to resist CG.
Animal Health Component
100%
Research Effort Categories
Basic
(N/A)
Applied
100%
Developmental
(N/A)
Classification

Knowledge Area (KA)Subject of Investigation (SOI)Field of Science (FOS)Percent
1010199205012%
1020199205011%
1110210205011%
2030930107011%
2055210107011%
2055360107011%
4027210202011%
4047210205011%
4057210205011%
Goals / Objectives
General Objective:Giant Key lime trees grafted onto HRS-812 rootstocks will be grown in contrasting soil types as experimental trees to determine their ability to resist Citrus Greening. Cover crops and Unmanned Aerial Vehicles (UAV) technology will be used. More Specific Objectives:1. Evaluate and determine the effect of different cover crop combinations on the physico-biochemical properties of the soil in the new Giant Key lime orchards growing in contrasting soil types.2. Develop stress indicators (i.e. water, nutrition and/or disease) through precision agricultural management using UAV's with Thermal Imager and in-situ soil moisture measurements of Giant Key lime orchards.
Project Methods
a) Evaluate and determine the effect of different cover crop (CC) combinations on the physico-biochemical properties of the soil in new Giant Key lime tree orchards growing in contrasting soil types.In each plot, we will collect soil samples before planting, and one and two years after planting (YAP), respectively, to determine changes of the physico-biochemical properties and fertility status of the soil by using the different combinations of CC treatments. Variables that will be measured include macro and micronutrient content, pH, OM, soil microbial community, aggregate stability, bulk density, porosity, soil penetration resistance and soil infiltration rate.b) Develop stress indicators (i.e. water, nutrition and/or disease) through precision agricultural management using UAVs with thermal images and in-situ soil moisture measurements in Giant Key lime tree orchards.The data generated from the UAVs flown on a weekly basis, will be correlated with in-situ soil moisture measurements that will be used for precise irrigation. The soil and plant fertility results will be used for precise fertigation of each experimental plot.

Progress 05/10/17 to 03/31/20

Outputs
Target Audience:Undergraduate and graduate students in Agronomy, Horticulture, Soils, Crop Protection and Civil/Agricultural Engineering Farmers in Puerto Rico and other tropical/subtropical locations Extension personnel who provide technical assistance to farmers Business people in the horticultural wholesale and retail industries 4-H and FFA community Department of Agriculture agronomists Government planners Department of Agriculture of Puerto Rico General public Changes/Problems: Nothing Reported What opportunities for training and professional development has the project provided?Thaks to this project, the student Wilmarie Alequín is performing her master in Horticulture. Her master proposal is entitled: The use of cover crops in Lime cv. Giant Key orchard on two different soil Orders in Puerto Rico. Also, due to this project the undergraduate Alexander Pérez from the Department of Civil Engineering and Survey is improving his UAV flying techniques and learning more about agriculture; specially citrus trees and cover crops. In addition, the master student Lorraine Santana who has a BS in Chemistry, is also learning about agriculture, citrus trees and cover crops. Also, this project have been visited by students of CFIT 3005 (Fundamentals of Crop Production) and HORT 4009 (Horticultural Crops) lab sections while they are visiting the AES's. How have the results been disseminated to communities of interest?The results from the different objectives have been disseminated in different workshops (i.e. 1.Microirrigation and 2. Cover crops workshops) open to general and professional audiences and in professional meetings (CFCS and SOPCA)- Please check the list of poster presentations and oral presentations. In addition, the information has been disseminated to the general public that contacted us directly. What do you plan to do during the next reporting period to accomplish the goals? Nothing Reported

Impacts
What was accomplished under these goals? We established the two citrus orchards (one at each of the Agricultural Experiment Stations in Isabela and Lajas). We performed two objectives, evaluating the effects of two cover crops versus control in the physical and chemical properties of the soil. In objective 1, we evaluated Cannavalia and Sunhemp versus natural vegetation (weeds) growing at each location, and in the second objectives we evaluated Pinto peanut and Bahiagrass versus natural vegetation. Under each objective, we collected data of soil, cover crops and natural vegetation, tree parameters and remote sensing data (UAV) from Isabela and Lajas AES-locations. Even though the project has finished, we are still collecting data and will be until September, 2020. At present, we are organizing and processing some of the data and plans are to have everything processed and analyzed by the end of the year( 2020). We expect to have manuscripts submitted in the JAUPR no later than May, 2021.

Publications

  • Type: Conference Papers and Presentations Status: Published Year Published: 2019 Citation: Wilmarie N. Alequ�n Otero, Rebecca Tirado Corbal�, Elide Valencia, Elvin Rom�n Paoli, Jonathan Mu�oz Barreto, Alexander P�rez Ortiz y Lorraine Santana Gonz�lez.2019. Efecto temporal del uso de canavalia y crotalaria en siembras de lima cv. Giant Key. Reuni�n Cient�fica y Asamblea Anual Sociedad Puertorrique�a de Ciencias Agr�colas (SOPCA). 6 de diciembre de 2019. Colegio de Agr�nomos de Puerto Rico. San Juan, Puerto Rico.
  • Type: Conference Papers and Presentations Status: Published Year Published: 2019 Citation: Alequ�n-Otero, W., R. Tirado-Corbal�, E. Valencia-Chin, E. Rom�n-Paoli, J. Mu�oz-Barreto., A. P�rez-Ortiz y L. Santana-Gonz�lez. 2019. Efecto del uso de plantas cobertoras en una siembra de la lima Giant Key (Citrus aurantafolia) en un Oxisol. 55ta reuni�n anual Sociedad Caribe�a de Cultivos Alimenticios (CFCS)8-12 de julio de 2019. Rep�blica Dominicana. Proyecto H-477.
  • Type: Conference Papers and Presentations Status: Published Year Published: 2019 Citation: Alequ�n-Otero, W., R. Tirado-Corbal�, E. Valencia-Chin, E. Rom�n-Paoli y L. Santana-Gonz�lez. 2019. Efecto del uso de plantas cobertoras en una siembra de la lima cv. Giant Key fertigada en un Oxisol. Taller de microriego: Logros y ense�anzas del Proyecto regional H-402 (W3128). 24 de mayo de 2019 en EEA- Isabela. Proyecto H- 477.
  • Type: Conference Papers and Presentations Status: Published Year Published: 2019 Citation: Alequ�n-Otero, W., R. Tirado-Corbal�, E. Rom�n-Paoli, E. Valencia-Chin,J. Mu�oz-Barreto., A. P�rez-Ortiz. Efecto temporal del uso de Canavalia y Caup� en las propiedades f�sicas de un "Typic Hapludox" en una siembra de lima cv. Giant Key. Plantas cobertoras y suelos de calidad: Un esfuerzo de nuestra naturaleza para un ambiente saludable. EEA-Lajas, 11 de octubre de 2019.


Progress 10/01/18 to 09/30/19

Outputs
Target Audience:Undergraduate and graduate students in Agronomy, Horticulture, Soils, Crop Protection and Civil/Agricultural Engineering Farmers in Puerto Rico and other tropical/subtropical locations Extension personnel who provide technical assistance to farmers Business people in the horticultural wholesale and retail industries 4-H and FFA community Department of Agriculture agronomists Government planners Department of Agriculture of Puerto Rico General public Changes/Problems:Due to the impact of hurricane Maria in the island, we needed to discard several batches of seeds. The experiment establishment and initiation was delayed over a year. Also, the amount of trees used in the experimental field changed (reduced a bit- Instead of having 5 trees per treatment we have 4) because some of them tested positive to Citrus Greening. -Also, we used different combinations of cover crops to the ones mentioned in the project proposal due to their response in the field and availability. Some of the seeds were purchased in Hancock Co, USA. What opportunities for training and professional development has the project provided?Under this project, the student Wilmarie Alequín is performing her master in Horticulture. Her master proposal is entitled: The use of cover crops in Lime cv. Giant Key orchard on two different soil Orders in Puerto Rico. Also, due to this project the undergraduate student Alexander Pérez, from the Department of Civil Engineering and Survey, is improving his UAV flying techniques and learning more about agriculture; specially citrus trees and cover crops. In addition, the master student Lorraine Santana who has a BS in Chemistry, is also learning about agriculture, citrus trees and cover crops. How have the results been disseminated to communities of interest?The results from the different objectives have been disseminated in different workshops (i.e. 1.Microirrigation and 2. Cover crops workshops) open to general and professional audiences and in professional meetings (CFCS and SOPCA)- Please check the list of poster presentations and oral presentations. In addition, the information has been disseminated to the general public that contact us directly. What do you plan to do during the next reporting period to accomplish the goals?I am planning to report the summary of all of the objectives from both locations (AES Lajas and Isabela). Also, provide manuscript titles and name of journals where the manuscript are intended to be published.

Impacts
What was accomplished under these goals? So far, in both locations ( AES of Isabela and Lajas) we established the Giant Key lime experimental orchards and used different cover crops between (UAV) citrus trees and between rows. Between trees we ran two cycles of radish versus control- no cover crops/ natural vegetation. Between citrus trees rows, we evaluated two cover crops at two different time. In the first objective, we evaluated Cannavalia and Sunn hemp cover crops versus natural vegetation; Johnson grass predominated at both locations. In the second objective, we evaluated Pinto peanut and Bahia grass cover crops versus natural vegetation; Johnson grass predominated at both locations. Citrus trees measurements have been collected since establishment up to date. Also, the drone (UAV) have been flown in the experimental field and it is proposed to be flown on a weekly basis up to the cover crops cover their respective areas. Manual measurements (MM) using a quadrant has been performed on a weekly basis to correlate the UAV data with respect to the MM. Soil sampling to characterize the soil chemically, biologically and physically has been performed at each location and also under the use of different cover crops. Some of the physical measurements have been analyzed. Chemical and biological results must be analyzed for statistical purposes.

Publications


    Progress 10/01/17 to 09/30/18

    Outputs
    Target Audience:Undergraduate and graduate students in Agronomy, Horticulture, Soils, Crop Protection and Civil/Agricultural Engineering Farmers in Puerto Rico and other tropical/subtropical locations Extension personnel who provide technical assistance to farmers Business people in the horticultural wholesale and retail industries 4-H and FFA community Department of Agriculture agronomists Government planners Department of Agriculture of Puerto Rico General public Changes/Problems:Due to impact of hurricane Maria to the island, we needed to throw several batch of seeds and the experiment establishment and initiation delay over a year. Also, the amount of trees used in the experimental field changes (reduce a bit- Instead of having 5 trees per treatment we will have 4) due to some of them tested positive to Citrus Greening. What opportunities for training and professional development has the project provided? Nothing Reported How have the results been disseminated to communities of interest?Nothing yet. What do you plan to do during the next reporting period to accomplish the goals?We are planning to establish the Lajas experimental field and collect data from both locations. Collect data from soil, cover crops, tree growth parameter, irrigation/fertigation, and with the drone.

    Impacts
    What was accomplished under these goals? Isabela Experiment- We established three seed banks of HRS 812 rootstock's in the citrus propagation greenhouse located in Isabela, PR. The first HRS 812 rootstock bank got affected with Hurricane María. The second bank was established in March 2018, after we got seeds from Dr. Kim Bowman (ARS scientisit in Florida). Half of this seed bank burned after one chemical was applied erroneously by one of the support employees. We throw a third seed bank and grafted them with with the experimental scion (Giant Key lime) and citrus trees (Rio Red Grapefruit) that will be used to bordering the experimental fields. These grafted bank will cover the trees needed in both locations. Half of the material was ready to be analyzed for Citrus greening and be planted. The material was analyzed for CG in mid- December 2018 and established in the field in the third week of December, 2018. The irrigation/fertigation system got established at the same time. We ordered the seeds of the desirable cover crops, we are still waiting for them. It proposed to plant them in late January, 2019. Citrus trees measurement has been collected since establishment. Also, the drone with thermal camera have been flown in the experimental field and it is proposed to be flown every two weeks before the cover crops have been seeded and in weekly basis up to the cover crops cover their respective areas. Initial soil sampling to characterize the soil chemically, biologically and physically have been performed (Late December 2018- beginning January 2019). Lajas Experiment- We expect to have the citrus material ready for late-January- early February, 2019. -We already ordered and received the following equipment's for both locations: a. Soil moisture equipment b. Penetration resistance equipment c. Bulk density soil sampler kit d. Radiometric Thermal camera e. Irrigation system- dosatron, tubings, irrigation lines, etc. - Both experimental fields are already selected.The radiometric thermal camera has been used and calibrated using another citrus orchards. Final adjustments will be given as soon as the fields have been establish.

    Publications


      Progress 05/10/17 to 09/30/17

      Outputs
      Target Audience: Nothing Reported Changes/Problems:The major problemexperienced was caused my hurricane Maria. The direct and indirect effects caused by hurricane Maria, affected theHRS-812 seed banks and seedlings needed to be grafted with the experimental "giant key lime (Citrus aurantifolia)" and border(Rio Red grapefruit) citrus varieties. More than a thousand HRS-812 seedlings were lost due to indirect effects (i.e. loss of water and electricity) of hurricane Maria. Actual problem, we need to get HRS-812 seeds from the US to be able to start the have HRS-812 rootstocks and graft them with giant key lime and Rio Red grapefruit. After achieving this part, we will need to wait around 3-4 months to have those trees ready for planting. What opportunities for training and professional development has the project provided? Nothing Reported How have the results been disseminated to communities of interest? Nothing Reported What do you plan to do during the next reporting period to accomplish the goals? Nothing Reported

      Impacts
      What was accomplished under these goals? Before hurricane Maria (HM) touch the island, we were able to sowmore than 1,000 HRS-812 citrus seeds needed to be used as rootstocks of the experimental "giant key lime (Citrus aurantifolia)" and border(Rio Red grapefruit) citrus varieties. At mid September, the rootstocks were ready to be grafted. However, direct and indirect effects of HM ruinedour HRS-812 seed stocks and sowHRS-812 rootstocks. During this research period (May 10th to September 30th, 2017), we ordered and received equipmentrequested for this project. Wereceived the following equipment: 1) Soil penetrometer, 2) Decagon 10 HS soil moisture sensors and dataloggers, and 3) Bulk density/ soil sampler kit. - We also ordered aSpectral camera but it wasreceived after theresearch period was over(After September 30th, 2017. - The fields where the experiments will be establishedat both locations (Agricultural Experiment Station of Isabela and Lajas) have been identified.

      Publications